Merge pull request #177 from puppetlabs/maint-os_refactor

(MAINT) Dropped support for windows server 2008 R2.

Author: chelnak

metadata.json

@@ -51,7 +51,6 @@
     {
       "operatingsystem": "windows",
       "operatingsystemrelease": [
-        "2008 R2",
         "2012 R2",
         "2016",
         "2019",