Review Request: Made the C++ implementaton of State return an Option (rather than mutate the passed in variable via a pointer).

[Benjamin Hindman]

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https://reviews.apache.org/r/6333/
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Review request for mesos and John Sirois.


Description
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See summary.


Diffs
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  src/java/jni/org_apache_mesos_state_ZooKeeperState.cpp 7697589 
  src/java/src/org/apache/mesos/state/ZooKeeperState.java 09c4739 
  src/state/state.hpp e18fb16 
  src/tests/state_tests.cpp 9697f33 

Diff: https://reviews.apache.org/r/6333/diff/


Testing
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make check


Thanks,

Benjamin Hindman