update bigcode

* submodules/bigcode 9502bad...43a58a9 (1):
  > Merge into master from pull request #18: handle indianess in ip checksum calc with odd lengths (https://github.com/floodlight/bigcode/pull/18)
  > Merge into master from pull request #19: timer_wheel: add missing ucli handlers array (https://github.com/floodlight/bigcode/pull/19)
update switchlight-common

* submodules/switchlight-common a0048fa...cc05e26 (2):
  > Merge into master from pull request #39: Fix clang warnings (https://github.com/floodlight/switchlight-common/pull/39)
  > Merge into master from pull request #38: arpa: use timer_wheel for timeouts (https://github.com/floodlight/switchlight-common/pull/38)
ivs: link in timer_wheel module
ivs: fix an incorrect memset in the CLI

Caught by clang.
ivs-ctl: fix an incorrect memset

Caught by clang.
l2table: disable optimize pragma on clang
upcall-latency-benchmark: remove nested function for clang
precheckin.py: add clang to default toolchains