Merge into master from pull request #140:
update submodules (https://github.com/floodlight/ivs/pull/140)
add environment variable to disable kflow installation

When debugging the controller (and using verbose logging on the switch)
it's often helpful to see the pipeline logs for every packet. This flag
prevents IVS from installing kernel flows, so every packet will be
received as an upcall.

Set it with the environment variable IVS_DISABLE_KFLOWS=1.
Merge into master from pull request #141:
add environment variable to disable kflow installation (https://github.com/floodlight/ivs/pull/141)
OVSDriver: make pretty-printer indent thread-local
ivs: tune malloc trim threshold

When processing a batch of messages in a single tick of the event loop, we
allocate a 64 KB block per message and then free them all at once after writing
to the socket. Looking at the strace, I noticed we were doing a brk() for every
message allocation. When freeing the messages we did another brk() which
released all the memory. The allocator has a limit on the amount of free memory
it will keep in the process before it starts releasing it back to the OS. Our
malloc churn is larger than the 128 KB default, so this change adjusts the trim
threshold to 2 MB.

This improves performance in my echo benchmark by 150%.
Merge into master from pull request #142:
OVSDriver: make pretty-printer indent thread-local (https://github.com/floodlight/ivs/pull/142)
ivs: add malloc include
Merge into master from pull request #143:
ivs: tune malloc trim threshold (https://github.com/floodlight/ivs/pull/143)
update indigo

* submodules/indigo da68342...8fcbf0f (1):
  > Merge into master from pull request #117: update submodules (https://github.com/floodlight/indigo/pull/117)
update infra

* submodules/infra 9bccd30...101ed4b (2):
  > Merge into master from pull request #22: Updates for use in shared libraries.  (https://github.com/floodlight/infra/pull/22)
  > Merge into master from pull request #20: AIM: add early check for log level (https://github.com/floodlight/infra/pull/20)
update loxigen-artifacts

* submodules/loxigen-artifacts 03c51fd...a592075 (6):
  > Artifacts from https://github.com/floodlight/loxigen/compare/68c19db0fa9a4465577ce17947e04bfb0bb88bf4...ac2a2da3d8ce47f2591899fac634873bd1e2cb60
  > Artifacts from https://github.com/floodlight/loxigen/compare/1c5679af766cc2785f088707e83dbd5b6ac0a698...68c19db0fa9a4465577ce17947e04bfb0bb88bf4
  > Artifacts from https://github.com/floodlight/loxigen/compare/ffa04cc24b045e010c3020e2cbb8ce31cbec8895...1c5679af766cc2785f088707e83dbd5b6ac0a698
  > Artifacts from https://github.com/floodlight/loxigen/compare/27a64222e92b38e23b253657c702986c0604145a...ffa04cc24b045e010c3020e2cbb8ce31cbec8895
  > Artifacts from https://github.com/floodlight/loxigen/compare/24b6c19d413555f2aaf9129c552f5128964fefe8...27a64222e92b38e23b253657c702986c0604145a
  > Artifacts from https://github.com/floodlight/loxigen/compare/767b11df765065ac1f815ceeb27690747b67fb09...24b6c19d413555f2aaf9129c552f5128964fefe8
OVSDriver: replace set-field OXM hack

The updated loci has a proper accessor for this.
OVSDriver: fix a getifaddrs leak
update indigo

* submodules/indigo 8fcbf0f...2e7089b (1):
  > Merge into master from pull request #113: SocketManager: use a timer wheel (https://github.com/floodlight/indigo/pull/113)
update infra

* submodules/infra 101ed4b...1bde450 (1):
  > Merge into master from pull request #21: modify log time format (https://github.com/floodlight/infra/pull/21)
Merge into master from pull request #144:
Update submodules and replace set-field OXM hack (https://github.com/floodlight/ivs/pull/144)
update indigo

* submodules/indigo 2e7089b...0156ec8 (3):
  > Merge into master from pull request #118: OFConnectionManager: batched message processing (https://github.com/floodlight/indigo/pull/118)
  > Merge into master from pull request #120: SocketManager: restrict priority range (https://github.com/floodlight/indigo/pull/120)
  > Merge into master from pull request #119: OFConnectionManager: populate auxiliary_id field in controller connections reply (https://github.com/floodlight/indigo/pull/119)