OVSDriver: remove IND_OVS_ACTION_CHECK_NW_TTL

This is no longer needed now that the pipeline receives the full OVS key,
including the TTL.
allow pipelines to set the metadata OXM in packet-in messages

Only 56 bits of metadata are supported because the packet-in reason takes 8
bits and the userdata nlattr (in old kernels) is only 64 bits.

This doesn't implement the full metadata matching and setting defined by OF
1.3. That will be possible after I do some refactoring of the action
translation code.
Merge into master from pull request #147:
update submodules (https://github.com/floodlight/ivs/pull/147)
Merge into master from pull request #146:
allow pipelines to set the metadata OXM in packet-in messages (https://github.com/floodlight/ivs/pull/146)
update indigo

* submodules/indigo 43629eb...42e8274 (1):
  > Merge into master from pull request #123: OFStateManager: override DROP packet-in listener result for ACTION reason (https://github.com/floodlight/indigo/pull/123)
update loxigen-artifacts

* submodules/loxigen-artifacts de0e2b7...82ba9ac (3):
  > Artifacts from https://github.com/floodlight/loxigen/compare/767c1484c2ae17ae63342eb2be5e42b8d364413c...76d44d5bcf9915db1012cafa24bd941bc992c173
  > Artifacts from https://github.com/floodlight/loxigen/compare/bfdf35bfa58677b3b62ccc00b8e7d0e86aa67ca8...767c1484c2ae17ae63342eb2be5e42b8d364413c
  > Artifacts from https://github.com/floodlight/loxigen/compare/4c9d1ec52942d8d11847d0374903b221b41d5646...bfdf35bfa58677b3b62ccc00b8e7d0e86aa67ca8
update switchlight-common

* submodules/switchlight-common 2318ad4...6b1204b (4):
  > Merge into master from pull request #43: arpa: look for ARP flag in the packet-in metadata instead of the reason (https://github.com/floodlight/switchlight-common/pull/43)
  > Merge into master from pull request #42: icmpa: support multiple pktin-reasons (https://github.com/floodlight/switchlight-common/pull/42)
  > Add ARP Response Agent.
  > Merge into master from pull request #41: Update switchlight-common and fix module utests (https://github.com/floodlight/switchlight-common/pull/41)