Review Request: Replaced some instances of triggers and SaveArg gmock actions with new FutureArg* gmock actions from libprocess.

[Benjamin Hindman]

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https://reviews.apache.org/r/10263/
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Review request for mesos, Vinod Kone and Ben Mahler.


Description
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See summary.


Diffs
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  src/tests/master_tests.cpp c74cb5e05dc068dc75c31fb85e03c71adf4d5ce9 
  src/tests/utils.hpp 32784a79804ecb8758fb9ae6cdb4bb1e87c29252 

Diff: https://reviews.apache.org/r/10263/diff/


Testing
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make check


Thanks,

Benjamin Hindman