Review Request: Fixed minor bug with framework registration retry. Also updated some concurrency issues that could cause tests to fail.

[Benjamin Hindman]

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https://reviews.apache.org/r/4369/
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Review request for mesos and Vinod Kone.


Summary
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See summary.


Diffs
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  src/tests/fault_tolerance_tests.cpp 089a92c 
  src/sched/sched.cpp 11abedb 
  src/master/master.cpp df43d01 

Diff: https://reviews.apache.org/r/4369/diff


Testing
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make check


Thanks,

Benjamin