Merge pull request puppetlabs#97 from michaeltlombardi/ticket/master/FM-8047-add-redhat8-support

(FM-8047) Add RedHat8 as supported OS

Author: lionce

metadata.json

@@ -37,7 +37,8 @@
       "operatingsystemrelease": [
         "5",
         "6",
-        "7"
+        "7",
+        "8"
       ]
     },
     {