Ethernet iface's with @ in ifname not properly supported

I run my develment environments in an lxc container. Inside of my virtual environment my ethernet address in Fedora is: eth0@if24

The 'optional strip' function of print_ip_addr.c does not seem to support this type of name.

I will submit a pull request that i believe will address the issue by looking for ':' and '@' and stripping after the first occurrence.

Start in print_ip_addr.c and inspect the optional strip function used for interface names. Reproduce the handling of an interface named eth0@if24, then verify that stripping stops after the first ':' or '@' occurrence and preserves the expected status-bar output.

Written by the indexing model from the issue text.