[HFX-1003] CA-118425/SCTX-1559: Remove interfaces from bridge before creating VLAN on it

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
Signed-off-by: Ravi Pandey <ravi.pandey@citrix.com>
Merge pull request #1622 from robhoes/clearwater-sp1-lcm

[HFX-1003] CA-118425/SCTX-1559: Remove interfaces from bridge before cre...