Adds support for WiredTiger Engine#61

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parinapatel wants to merge 7 commits intosensu-plugins:masterfrom

parinapatel:master

Commits on Feb 14, 2018

added new metrics for wiredtiger
Parin
committed
Minor fixes
Parin
committed
Added Change log
Parin
committed

Commits on Sep 13, 2018

Merge current master and fixed build errors
Parin
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Fix some test and optional arguments
Parin
committed

Commits on Sep 20, 2018

fix tests and refactored wiretiger metrics.
Parin
committed

Commits on Mar 25, 2019

temp
Parin
committed