Backports PR #8945
**Commit 1:**
[plugin cli] Wrap arguments in quotes to preserve whitespace
* Original sha: 18d6e921ef
* Authored by Jonathan Budzenski <jon@jbudz.me> on 2016-11-02T17:28:49Z
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**Commit 1:**
Printing process warning's via the appropriate logger
* Original sha: 96ef75b980
* Authored by = <brandon.kobel@elastic.co> on 2016-10-19T10:41:45Z