remove colon from VLAN regex pattern

colons are not used to designate VLANs, but rather virtual interfaces
such as eth0:1.  this is commonly used to add a second IP address
to an interface.

from /etc/sysconfig/network-scripts/ifup:
MATCH='^.+\.[0-9]{1,4}$'
Merge pull request #992 from aronparsons/revert-vlan-pattern

remove colon from VLAN regex pattern