Use which to test for gpg2
Use which to test for gpg2

Running gpg2 directly fails on systems without this command.  Puppet pre checks for commands in the path.

Adaptavist/puppet-rvm,holstvoogd/puppet-rvm,srclab/puppet-rvm,jangrewe/puppet-rvm,squarit/puppet-rvm,holstvoogd/puppet-rvm,maestrodev/puppet-rvm,skyscrapers/puppet-rvm,mklette/puppet-rvm,srclab/puppet-rvm,jangrewe/puppet-rvm,maestrodev/puppet-rvm,mklette/puppet-rvm,Adaptavist/puppet-rvm,skyscrapers/puppet-rvm,squarit/puppet-rvm