OFStateManager: allocate ind_core_table_t.name inline

It's small and we need the full length to pass to
of_table_stats_entry_name_set.
OFStateManager: track num_flows per registered table

This will be used by the table stats handler.
OFStateManager: add table operation to get table stats

This is called instead of the Forwarding API when any flowtables have been
registered with the new flowtable API.
OFStateManager: add weak symbol for indigo_fwd_table_stats_get
Merge remote-tracking branch 'origin/master' into table-stats

Conflicts:
	modules/OFStateManager/module/src/handlers.c
Merge into master from pull request #139:
Add operation to get table stats (https://github.com/floodlight/indigo/pull/139)