Remove ovs-vsctl call from OVSInterfaceDriver

ovs_lib module is responsible for the interaction with OVS but
OVSInterfaceDriver._ovs_add_port() method calls directly
ovs-vsctl which implies inconsistencies: ovs_lib calls ovs-vsctl
with a timeout but not OVSInterfaceDriver._ovs_add_port().

This change moves ovs-vsctl call in OVSInterfaceDriver._ovs_add_port
to ovs_lib.

Closes-Bug: #1396489
Change-Id: I4d03f8beef2c5f2366ad2d1cf5f0b18b4f2857cd
Update i18n translation for Brocade plugin log msg's

All the log messages now have the required hints. In addition to
this debug messages are not translated.

This is done for the plugins/brocade directory.

Change-Id: I2ac926fd72037bb8f0605267ad50472c447ae83d
Merge "Update i18n translation for Brocade plugin log msg's"
Merge "Remove ovs-vsctl call from OVSInterfaceDriver"