pipeline_standard: register group table

This commit handles group-mods. Forwarding using groups is not yet supported.
pipeline_standard: add group stats
pipeline_standard: basic group forwarding

References to groups are acquired during OpenFlow action translation. The new
function pipeline_standard_cleanup_actions releases them.
pipeline_standard: hash CFR for SELECT groups
pipeline_standard: update group bucket stats
pipeline_standard: add a few validation checks for groups
OVSDriver: remove groups code from IVS core

Replaced by the new code in pipeline_standard.
pipeline_standard: rename openflow action translation function

I forgot to change the name when I moved it out of IVS core a while ago.
ivs: update OF 1.3 test list
Merge remote-tracking branch 'origin/master' into move-groups

Conflicts:
	modules/pipeline_standard/module/src/action.c
	modules/pipeline_standard/module/src/action.h
pipeline_standard: use BAD_ACTION error code in action translation
Merge into master from pull request #195:
move groups out of IVS core (https://github.com/floodlight/ivs/pull/195)