There has been some confusion when configbmc changes
are deferred until later.
Reduce confusion by waiting for the settings to take effect,
but avoiding checking each parameter
to preserve most of the speedup.
If the kernel is new enough to do SKU, but the firmware doesn't have it,
fallback to model.
Fix outright mistakes in the config_port_tsm code
Up mac count from 2 to 3. If querying cumulus switches using SNMP
the switch will add its own mac to the list bringing the
total for a shared port to 3.
