Removing mlnxvif Mellanox package

The package is removed since in Juno nova blocked the option
to add an external vif_driver, so this will no longer be in use.

Partial-bug: #1386865
Related-bug: #1386858
Related-bug: #1391797

Change-Id: Ib94525e240eae226fc5066b4ab3ceafd0619a369
Signed-off-by: gilmeir <gilmeir@mellanox.com>
Merge "Removing mlnxvif Mellanox package"