OFStateManager: remove calls to old flowtable API

All flowtables must now be registered with indigo_core_table_register.
OFStateManager: remove weak symbols for old flowtable APIs
indigo: remove deprecated flowtable APIs

These have been replaced by indigo_core_table_register.
OFStateManager: remove uses of deprecated group APIs
OFStateManager: remove weak symbols for deprecated group APIs
indigo: remove deprecated group APIs

These have been replaced by indigo_core_group_table_register.
Merge into master from pull request #170:
Remove deprecated APIs (https://github.com/floodlight/indigo/pull/170)