Review Request 37024: Add an endpoint that exposes component version.

[haosdent huang]

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https://reviews.apache.org/r/37024/
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Review request for mesos and Ben Mahler.


Bugs: MESOS-1841
    https://issues.apache.org/jira/browse/MESOS-1841


Repository: mesos


Description
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Add an endpoint that exposes component version.


Diffs
-----

  src/master/http.cpp 3772e39015a22655dcad00ad844dc5ddc90db43f 
  src/master/master.hpp ea18c4e0bb0743747401b9cd5ea14ae9b56ae3cc 
  src/master/master.cpp 351a3c2b5f551ad065682cea601d2436258e4544 
  src/slave/http.cpp b0fe5f520dfca156548ba8c436d42fc432223f3d 
  src/slave/slave.hpp 41d09497be313819a9c78361b8595f6f26dc8460 
  src/slave/slave.cpp 6b21db973dc95dd5eb2238eebe697db9dd063ef1 

Diff: https://reviews.apache.org/r/37024/diff/


Testing
-------

Manual test result:

```
$ curl http://localhost:5050/slave(1)/version.json 2>/dev/null|jq .
{
  "version": "0.24.0"
}
```

```
$ curl http://localhost:5050/master/version.json 2>/dev/null|jq .
{
  "version": "0.24.0"
}
```


Thanks,

haosdent huang