Review Request 36498: Implemented the OFFERS Event handler in the scheduler driver.

[Ben Mahler]

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Review request for mesos and Vinod Kone.


Bugs: MESOS-2910 and MESOS-3012
    https://issues.apache.org/jira/browse/MESOS-2910
    https://issues.apache.org/jira/browse/MESOS-3012


Repository: mesos


Description
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This relies on 'Offer.url' to compute the pids needed for the message passing 
optimization (see 
[MESOS-3012](https://issues.apache.org/jira/browse/MESOS-3012)).


Diffs
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  src/sched/sched.cpp e372a15db035f74d525561839b873ed659e2c33f 
  src/tests/scheduler_event_call_tests.cpp PRE-CREATION 

Diff: https://reviews.apache.org/r/36498/diff/


Testing
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Added a test.


Thanks,

Ben Mahler