Run syntax check for OCF scripts

Make fuel_syntax_check.sh script run syntax check for any file
found under "files/ocf/" subfolder in all puppet modules.

Also bugfix for "rake spec" testing part of the script.

Change-Id: I83c5bb1366b9284ff411c3e3e54e3a27c4049815
Closes-bug: 1376254
Closes-bug: 1378857
DocImpact
Merge "Run syntax check for OCF scripts"