Add timeout_ms option for rd_kafka_commit, rd_kafka_commit_message

[kenneth-jia]

Add an additional parameter (timeout_ms) for rd_kafka_commit/rd_kafka_commit_message. To avoid stuck there forever while a consumer is trying to sync-commit but no response from brokers (e.g. brokers unexpected down)

[kenneth-jia]

Hi, @edenhill , I found it's really hard to fix the check/style (pull_request) failure. I've tried clang-format -style=.clang-format, -- it didn't work; also tried make style-fix, but didn't work either. I guess the check/style is newly added but most source files would fail the checking at present (even with no change from this PR)? Thanks, Kenneth

[edenhill]

Regarding the style: clang-format seems to be broken on OSX. Running it on Linux yields good results.

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