tests fail when run in chroot (during package building)

Helloes!
I'm currently pushing python-ethtool to Arch Linux's [community].
On Arch, packages are built in a clean chroot (to ensure package and dependency integrity). There however, the tests fail:

```
running test
running egg_info
creating ethtool.egg-info
writing ethtool.egg-info/PKG-INFO
writing dependency_links to ethtool.egg-info/dependency_links.txt
writing top-level names to ethtool.egg-info/top_level.txt
writing manifest file 'ethtool.egg-info/SOURCES.txt'
reading manifest file 'ethtool.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'ethtool.egg-info/SOURCES.txt'
running build_ext
copying build/lib.linux-x86_64-3.6/ethtool.cpython-36m-x86_64-linux-gnu.so ->
test_driver_eth (tests.test_scripts.ScriptsTests) ... ok
test_driver_lo (tests.test_scripts.ScriptsTests) ... ok
test_flags2str (tests.test_scripts.ScriptsTests) ... ok
test_show_coalesce_eth (tests.test_scripts.ScriptsTests) ... ok
test_show_coalesce_lo (tests.test_scripts.ScriptsTests) ... ok
test_show_offload_eth (tests.test_scripts.ScriptsTests) ... ok
test_show_offload_lo (tests.test_scripts.ScriptsTests) ... FAIL
test_show_ring_eth (tests.test_scripts.ScriptsTests) ... ok
test_show_ring_lo (tests.test_scripts.ScriptsTests) ... ok
test_etherinfo_objects (tests.test_ethtool.EthtoolTests) ... FAIL
test_get_active_devices (tests.test_ethtool.EthtoolTests) ... ERROR
test_get_interface_info_active (tests.test_ethtool.EthtoolTests) ... FAIL
test_get_interface_info_all (tests.test_ethtool.EthtoolTests) ... FAIL
test_get_interface_info_invalid (tests.test_ethtool.EthtoolTests) ... ok
test_invalid_devices (tests.test_ethtool.EthtoolTests) ... ok
test_full (tests.parse_ifconfig.ParserTests) ... ok
test_local (tests.parse_ifconfig.ParserTests) ... ok
test_parse_ip4addr (tests.parse_ifconfig.ParserTests) ... ok
test_parsing_device_line (tests.parse_ifconfig.ParserTests) ... ok
test_parsing_flags_line (tests.parse_ifconfig.ParserTests) ... ok
test_parsing_ip (tests.parse_ifconfig.ParserTests) ... ok

======================================================================
ERROR: test_get_active_devices (tests.test_ethtool.EthtoolTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 245, in test_get_active_devices
self._functions_accepting_devnames(devname)
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 147, in _functions_accepting_devnames
self.assertIsInt(ethtool.get_ufo(devname))
PermissionError: [Errno 1] Operation not permitted

======================================================================
FAIL: test_show_offload_lo (tests.test_scripts.ScriptsTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_scripts.py", line 80, in test_show_offload_lo
'''
AssertionError: 'scat[60 chars]ion offload: not supported\ngeneric segmentation offload: on\n' != 'scat[60 chars]ion offload: on\ngeneric segmentation offload: on\n'
scatter-gather: on
tcp segmentation offload: on
- udp fragmentation offload: not supported
? ------------
+ udp fragmentation offload: on
? +
generic segmentation offload: on

======================================================================
FAIL: test_etherinfo_objects (tests.test_ethtool.EthtoolTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 251, in test_etherinfo_objects
self._verify_etherinfo_object(ei)
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 168, in _verify_etherinfo_object
self.assertEqual(ei.ipv4_address, scraped.inet)
AssertionError: '10.10.23.10' != '10.10.23.150'
- 10.10.23.10
+ 10.10.23.150
? +


======================================================================
FAIL: test_get_interface_info_active (tests.test_ethtool.EthtoolTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 233, in test_get_interface_info_active
self._verify_etherinfo_object(ei)
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 168, in _verify_etherinfo_object
self.assertEqual(ei.ipv4_address, scraped.inet)
AssertionError: '10.10.23.10' != '10.10.23.150'
- 10.10.23.10
+ 10.10.23.150
? +


======================================================================
FAIL: test_get_interface_info_all (tests.test_ethtool.EthtoolTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 238, in test_get_interface_info_all
self._verify_etherinfo_object(ei)
File "/build/python-ethtool/src/python-ethtool-0.13/tests/test_ethtool.py", line 168, in _verify_etherinfo_object
self.assertEqual(ei.ipv4_address, scraped.inet)
AssertionError: '10.10.23.10' != '10.10.23.150'
- 10.10.23.10
+ 10.10.23.150
? +


----------------------------------------------------------------------
Ran 21 tests in 0.015s

FAILED (failures=4, errors=1)
Test failed:
Device(name='enp0s25', flagsint=4163, flagsstr='UP,BROADCAST,RUNNING,MULTICAST', mtu=1500)
Device(name='lo', flagsint=73, flagsstr='UP,LOOPBACK,RUNNING', mtu=65536)
Device(name='tap0', flagsint=4163, flagsstr='UP,BROADCAST,RUNNING,MULTICAST', mtu=1500)
Device(name='wlp3s0', flagsint=4099, flagsstr='UP,BROADCAST,MULTICAST', mtu=1500)
error: Test failed:

```
Within the chroot, the user, that's building the package is not allowed root privileges. This might lead to the tests failing, but maybe you can provide some more insight?
I'd like to be able to use the tests during packaging for python{2,3}.