Do not always crash syncd with event process error, provide SAI API f…#315

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jipanyang wants to merge 8 commits intosonic-net:masterfrom

jipanyang:sai_feed_back

Commits on May 2, 2018

Remove unused local variable
jipanyang
committed

Commits on May 4, 2018

libSAI API call switch create often takes up to 10 seconds, adjust the wait time to 30 seconds
jipanyang
committed