WiP: VRF MIB Discovery

Presenting improved VRF discovery.. Even though polling of the VRF works by CISCO-VRF-MIB I am calling this a work in progress because there is still be code improvements todo, and the layout in the VRF global page is not correctly parsed because no RD is provided by cisco-vrf-mib.

• Old vrf code is copied into two new file, old code stil exists
• New module is enabled and old is disabled in defaults
• Pictures are from device ports page and global vrf page (which will be messed up from vrf discovered by cisco vrf mib)
• Tested on Cisco 3800, 2951, 1921 and 880 devices

• • Patch only applies with 'svn patch' for some reason

Any suggestions etc. are welcome