Merge pull request puppetlabs#912 from pmcmaw/rm_ubuntu

(MODULES-5501) - Remove unsupported Ubuntu

Author: tphoney

metadata.json

@@ -57,8 +57,6 @@
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "10.04",
-        "12.04",
         "14.04",
         "16.04"
       ]