Review Request 48911: Show orphan tasks in WebUI.

[Tomasz Janiszewski]

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https://reviews.apache.org/r/48911/
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Review request for mesos, Benjamin Mahler, haosdent huang, Ross Allen, and 
Vinod Kone.


Repository: mesos


Description
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Added orphan tasks count on left side table.
Added orphan tasks table under completed tasks.
Fixed setting tasks.finish_time, if task is running
this value won't be set.


Diffs
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  src/webui/master/static/home.html a8c8c20ce7659eecd621fcf7714fac9274155d67 
  src/webui/master/static/js/controllers.js 
fcb6242003326ab608aa72e6b881f8dbb9822b94 

Diff: https://reviews.apache.org/r/48911/diff/


Testing
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![orphan 
task](https://issues.apache.org/jira/secure/attachment/12811676/orphan_tasks.png)


Thanks,

Tomasz Janiszewski