Added Interface VLAN Support, and support for interface without IP addr

[f3rr]

Hey,
I just added support for "VLAN=yes" for interface file.
There was also a bug, i wasnt able to setup an interface without IP address. Thats also fixed now.

[razorsedge]

Hey,
Two issues: 1) Can you split this out into two separate PRs? One of your improvements may already be addressed in issue #48. 2) Resubmit this PR against razorsedge:develop.

[Peter-Git-Hub]

I need to setup a trunked interface and the fact this functionality has not made it into the main branch means I can't proceed. Can someone please work on this issue.

[razorsedge]

@Peter-Git-Hub Does the following not work for you?

Normal interface - VLAN - no IP:

class { 'network::global':
  vlan => 'yes',
}

network::if { 'eth0.330':
  ensure => 'up',
}