Merge pull request puppetlabs#664 from domcleal/tickets/master/MODULES-2185-withenv-2.7

(MODULES-2185) Fix `withenv` execution under Puppet 2.7

Author: DavidS

lib/puppet/provider/postgresql_psql/ruby.rb

@@ -50,7 +50,12 @@ def get_environment
   def run_command(command, user, group)
     command = command.join ' '
     environment = get_environment
-    if Puppet::PUPPETVERSION.to_f < 3.4
+    if Puppet::PUPPETVERSION.to_f < 3.0
+      require 'puppet/util/execution'
+      Puppet::Util::Execution.withenv environment do
+        Puppet::Util::SUIDManager.run_and_capture(command, user, group)
+      end
+    elsif Puppet::PUPPETVERSION.to_f < 3.4
       Puppet::Util.withenv environment do
         Puppet::Util::SUIDManager.run_and_capture(command, user, group)
       end