Merge pull request #410 from puppetlabs/maint-os_refactor

(MAINT) Drop support for Solaris 10, Windows Server 2008 R2 and Windows 7+8.1

Author: GSPatton

metadata.json

@@ -67,7 +67,6 @@
     {
       "operatingsystem": "Solaris",
       "operatingsystemrelease": [
-        "10",
         "11"
       ]
     },
@@ -80,13 +79,10 @@
     {
       "operatingsystem": "Windows",
       "operatingsystemrelease": [
-        "2008 R2",
         "2012",
         "2012 R2",
         "2016",
         "2019",
-        "7",
-        "8.1",
         "10"
       ]
     },