Added UI restrictions for Mellanox features

This commit includes changes in UI restrictions:
  1. Restrict nova-network and GRE with Mellanox plugin.
  2. Block ports bonding in case of iSER storage or Mellanox
     SR-IOV plugin.
  3. Add probed VF limitation explanation to iSER checkbox.

closes-bug: #1336867
partially implements: blueprint mellanox-features-support

Change-Id: Ida76317dd5fdc5e3813c3b4279b5db5239d6c754
Signed-off-by: Aviram Bar-Haim <aviramb@mellanox.com>
Merge "Added UI restrictions for Mellanox features"