Specify versions for VMware env

The following VMware NSX, vCenter and ESXi version were tested:

- vCenter 5.5
- NSX 4.0.1 (Gateway, Manager, Controller, Service node)
- NSX OVS 2.0 (it's not a vanilla OVS, it's NSX OVS = NSX bits)

The following lab setup is used:

- MOS 6.0 on Centos 6.5 - was tested and working
- MOS 6.0 on Ubuntu 12.04 - was tested and not working
,because of the incompatibility of Linux version
 (it's 3.13) and NSX OVS version (2.0)

Change-Id: I34869d8197ab2c6a5fa5af815e5f079ce844f201
Partial-Bug: 1403013
Partial-Bug: 1403122
(cherry picked from commit 18b035f4b7bb03d5aa26c59f8de68ab945c549a8)