Review Request: Updated all calls to 'strings::format' to remove need for invoking 'c_str()' on std::string arguments.

[Benjamin Hindman]

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https://reviews.apache.org/r/5710/
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Review request for mesos and Vinod Kone.


Description
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See summary.


Diffs
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  src/common/utils.hpp 93192e7 
  src/configurator/configuration.hpp 0abad77 
  src/master/master.cpp 89cdaf6 
  src/tests/strings_tests.cpp 53b037f 
  src/zookeeper/group.cpp a4a8b5a 

Diff: https://reviews.apache.org/r/5710/diff/


Testing
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make check


Thanks,

Benjamin Hindman