The mac ageing configuration on linux bridges is now
conditional and caller controlled. By default mac ageing
is unspecified and will use the kernel's default of 300
seconds. For ovs with hybrid plug we override this to
0 to prevent packet loss issue during some migration
edgecases. This change reverts disabling mac ageing
for the linux bridge plugin which was accidentally
introduced during the brctl removal via inheriting the
ovs plugin's default behavior when the bridge create
code became shared.
Change-Id: I95612352de6cdb47de98eb80c208dd1a74499d41
Closes-bug: #1837252
655c83d706