ivs-ctl: add dump-flows command

The code is similar to OVSDriver's dump.c, but the output is intended for
normal human consumption. Only a subset of key and action attributes are
supported.
Merge into master from pull request #194:
ivs-ctl: add dump-flows command (https://github.com/floodlight/ivs/pull/194)
action: support setting OVS_KEY_ATTR_PRIORITY
pipeline_standard: translate set-queue actions to setting priority
ivs: enable MSG loglevel
OVSDriver: translate OF_ACTION_SET_QUEUE in packet-outs
Merge into master from pull request #196:
translate set-queue actions to setting skb->priority (https://github.com/floodlight/ivs/pull/196)
Merge remote-tracking branch 'origin/master' into move-groups

Conflicts:
	modules/pipeline_standard/module/src/action.c
	modules/pipeline_standard/module/src/action.h