Review Request 65967: Eliminated some copying in the master's Accept call handler path.

[Benjamin Mahler]

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Review request for mesos and Meng Zhu.


Bugs: MESOS-8628
    https://issues.apache.org/jira/browse/MESOS-8628


Repository: mesos


Description
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This eliminates two copies of the `Accept` message.


Diffs
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  src/master/http.cpp acf10a0f396234ec9f444c9b41515d657379d6ad 
  src/master/master.hpp c9c8a968b6f56fe261ac9fe374e926a28d40fccb 
  src/master/master.cpp e666b664dd125317cda5d16285d444b9c21e1f35 


Diff: https://reviews.apache.org/r/65967/diff/1/


Testing
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make check


Thanks,

Benjamin Mahler