Review Request 38899: Added handler for Executor->Framework message for the Executor HTTP API

[Anand Mazumdar]

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Review request for mesos, Isabel Jimenez and Vinod Kone.


Bugs: MESOS-2296
    https://issues.apache.org/jira/browse/MESOS-2296


Repository: mesos


Description
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Trivial change to call the `executorMessage(...)` function that already existed 
in `src/slave/slave.cpp` to handle ExecutorToFrameworkMessage.


Diffs
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  src/slave/http.cpp f9cf7bbe81b7fe9637de9a8d66329c16a7e1a89b 

Diff: https://reviews.apache.org/r/38899/diff/


Testing
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make check. Would add tests later after the MESOS-3480 review chain gets 
committed.


Thanks,

Anand Mazumdar