Ubuntu 14/16/17: Drop code leftovers

This was previously done in
#1331.

Author: bastelfreak

manifests/globals.pp

@@ -201,10 +201,6 @@
         default => undef,
       },
       'Ubuntu' => $facts['os']['release']['major'] ? {
-        /^(14.04)$/ => '9.3',
-        /^(14.10|15.04|15.10)$/ => '9.4',
-        /^(16.04|16.10)$/ => '9.5',
-        /^(17.04|17.10)$/ => '9.6',
         /^(18.04)$/ => '10',
         /^(20.04)$/ => '12',
         /^(21.04|21.10)$/ => '13',