Merge pull request #198 from puppetlabs/maint-os_refactor

(MAINT) Drop support for Windows Server 2008 R2.

Author: GSPatton

metadata.json

@@ -52,7 +52,6 @@
       "operatingsystem": "Windows",
       "operatingsystemrelease": [
         "10",
-        "2008 R2",
         "2012 R2",
         "2016",
         "2019",