Review Request 57105: Updated a few functions in the master to be declared `const`.

[Michael Park]

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Review request for mesos and Benjamin Mahler.


Bugs: MESOS-6627
    https://issues.apache.org/jira/browse/MESOS-6627


Repository: mesos


Description
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See summary.


Diffs
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  src/master/master.hpp 764adb18ddf09b62529c5c96f8e4dfaf7803483e 
  src/master/master.cpp 2ef836536784d5fda23c80dc2304239b176a8942 

Diff: https://reviews.apache.org/r/57105/diff/


Testing
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`make check`


Thanks,

Michael Park