Merge pull request #267 from puppetlabs/maint-os_refactor

(MAINT) Dropped support for Windows(7,8, 2008 Server and 2008 R2 Server)

Author: pmcmaw

metadata.json

@@ -14,11 +14,7 @@
     {
       "operatingsystem": "Windows",
       "operatingsystemrelease": [
-        "7",
-        "8",
         "10",
-        "2008",
-        "2008 R2",
         "2012",
         "2012 R2",
         "2016",