Merge pull request DataDog#259 from sethcleveland/fix_redhat_gpg_path

Change /bin/gpg to /usr/bin/gpg: this was asserted on CentOS and Fedora

Author: truthbk

manifests/redhat.pp

@@ -37,15 +37,15 @@
 
     exec { 'install-gpg-key':
         command => "/bin/rpm --import ${public_key_local}",
-        onlyif  => "/bin/gpg --quiet --with-fingerprint -n ${public_key_local} | grep \'A4C0 B90D 7443 CF6E 4E8A  A341 F106 8E14 E094 22B3\'",
+        onlyif  => "/usr/bin/gpg --quiet --with-fingerprint -n ${public_key_local} | grep \'A4C0 B90D 7443 CF6E 4E8A  A341 F106 8E14 E094 22B3\'",
         unless  => '/bin/rpm -q gpg-pubkey-e09422b3',
         require => Remote_file['DATADOG_RPM_KEY.public'],
         notify  => Exec['cleanup-gpg-key'],
     }
 
     exec { 'cleanup-gpg-key':
         command => "/bin/rm ${public_key_local}",
-        onlyif  => "/bin/test -f ${public_key_local}",
+        onlyif  => "/usr/bin/test -f ${public_key_local}",
     }
 
     yumrepo {'datadog':