Review Request 21787: Keep track of the principals for authenticated pids in Master and verify FramworkInfo::principal during (re-)registration.

[Jiang Yan Xu]

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Review request for mesos and Vinod Kone.


Bugs: MESOS-1373
    https://issues.apache.org/jira/browse/MESOS-1373


Repository: mesos-git


Description
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This will be used to 'Add "per-framework-principal" counters for all messages 
from a scheduler on Master': https://issues.apache.org/jira/browse/MESOS-1339


Diffs
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  include/mesos/mesos.proto 8012873f853fdee47f8cb2f5d9dbb7cd8ccc6028 
  src/master/master.hpp 5e0d712de997bd10079655df9b07099284f8257f 
  src/master/master.cpp 075755cad5c50a57c92d7d82f2466b467796f673 
  src/tests/authentication_tests.cpp b60e595216c2b854adf048002a0d88b548e1d92e 
  src/tests/mesos.hpp a1a7d7991c4cdb7a994218602fe4e5d76c056456 

Diff: https://reviews.apache.org/r/21787/diff/


Testing
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Added tests. Make check.


Thanks,

Jiang Yan Xu