Documentation: man pages update

Adapting the following manpages from sysconfig:
  ifcfg-bonding.5
  ifcfg-bridge.5
  ifcfg-vlan.5
  ifcfg-wireless.5
  ifcfg.5
  ifdown.8
  ifstatus.8
  ifup.8
client: Add force options to ifup script (ifdown only)
Merge pull request #133 from pwieczorkiewicz/merge-08012014

Man pages updates