`sudo setup.py install` installs ccm egg only readable by root

Using Ubuntu 16.04 with default python installation:

```
$ sudo python setup.py install
$ ccm
Traceback (most recent call last):
File "/usr/local/bin/ccm", line 4, in
__import__('pkg_resources').run_script('ccm==2.1.7', 'ccm')
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2927, in
@_call_aside
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 635, in _build_master
ws.require(__requires__)
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 943, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 829, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'ccm==2.1.7' distribution was not found and is required by the application
$ sudo ccm
Missing arguments
Usage:
ccm [options]
ccm [options]

Where is one of
create Create a new cluster
add Add a new node to the current cluster
populate Add a group of new nodes with default options
list List existing clusters

$ ls -l /usr/local/lib/python2.7/dist-packages/ccm-2.1.7-py2.7.egg
-rwxrwx--- 1 root staff 158742 Jun 7 14:24 /usr/local/lib/python2.7/dist-packages/ccm-2.1.7-py2.7.egg
```