Updated Arch Linux add_ip/del_ip scripts to support new netcfg configuration.

Submitted patch supports old rc.conf configuration, correctly sets
netmasks, removed trailing whitespace. Please let me know if there is
anything else.

I have tested the scripts with older (2011) and current Arch installs.

http://bugzilla.openvz.org/2280

[kir@openvz.org: removed whitespace at EOF]
2 files changed