Does not parse /proc/net/dev correctly on Centos 5 systems

[danielnelson]

On Centos 5 systems a minor difference in the /proc/net/dev file is causing it to not be parsed fully.

Thanks to the research of @Fiery-Fenix I traced it back to #317. To add support for interface aliases, we began parsing until ": ", but on Centos 5 there is no space. I think a suitable fix would be to parse until the last index of ":".

[root@hostA ~]# cat /proc/net/dev
Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:32108095  555355    0    0    0     0          0         0 32108095  555355    0    0    0     0       0          0
  eth0:5019464820 14784542    0    0    0     0          0     34733 8907551793 12498214    0    0    0     0       0          0

[danielnelson]

I can work on a fix.

[danielnelson]

Nevermind you already fixed this in #357.

[shirou]

Roger.

Thanks @ablagoev. Your information and PR save the people.