Merge into master from pull request #32:
update indigo to 9e7b84487d53ddd9e5ac9e235c3bec5eb3e0ada0 (https://github.com/floodlight/ivs/pull/32)
OVSDriver: check for zero ttl when processing OF_ACTION_NICIRA_DEC_TTL

This could previously underflow if we received a packet with ttl == 0.

Partial fix for XE-51.
Merge into master from pull request #33:
OVSDriver: check for zero ttl when processing OF_ACTION_NICIRA_DEC_TTL (https://github.com/floodlight/ivs/pull/33)
add luajit submodule at 21af151 (version 2.0.2)
luajit: add build infrastructure
Merge into master from pull request #34:
add luajit submodule (https://github.com/floodlight/ivs/pull/34)
ivs: add USE_LUAJIT make flag
Merge into master from pull request #35:
ivs: add USE_LUAJIT make flag (https://github.com/floodlight/ivs/pull/35)
Add port_desc_stats processing support

Add support port_desc_stats_request in indigo,
which is typically Openflow 1.3 OFPT_MULTIPART_REQUEST
with MFPMP_PORT_DESC.

Signed-off-by: Hiroaki KAWAI <kawai@stratosphere.co.jp>
Merge into master from pull request #36:
Add port_desc_stats processing support (https://github.com/floodlight/ivs/pull/36)
xbuf: initial commit

This module provides an expandable buffer datastructure. The main use will be
efficient lists of small elements, like the upcoming internal action
representation. It includes Netlink-compatible attributes which can be nested.
OVSDriver: remove unused hash_mask creation
OVSDriver: translate actions to an internal form

There are a few reasons to do this:
 - Abstract out some differences between OF 1.0/1.3 (mostly set-field actions).
 - Create richer actions than in OpenFlow.
 - Speed up action translation in the upcall path.
xbuf: add compact operation

Use it in OVSDriver to slightly reduce memory usage.
add support for profile-guided optimization

I did not see any improvement when using this optimization.
ivs: add linker options for luajit
OVSDriver: add stub action for OFPP_NORMAL
Merge into master from pull request #38:
trivial Makefile additions (https://github.com/floodlight/ivs/pull/38)
xbuf: clear fields in cleanup
add xbuf utest to precheckins