[REFACTOR] fixes #2967 - refactored Fact Importer

Based on Dmitri Dolguikh <dmitri@appliedlogic.ca> original patch.

- renamed original fact_importer class to fact_parser class
- moved fact handling logic to its own fact_importer class
- fact importer now assumes single-value facts...

fixes #3222 - nil the certname when handling certs if UUID certs have now been disabled

(cherry picked from commit 89e506f7d955b4b440725fb5ef412fb2634cd762)

fixes #2179 - validate the owner type, preventing the API returning errors for a wrong owner_type

fixes #2260 Allow ERB in ENC global / class parameters

Adds code to parse the global & class parameters, and adds a setting (default true)
to disable this if needed. Also has some tests.

Refs #2414 - Remove Puppet from facts API and Settings

Reports are still in progress and will come in a later PR
DB schema is updated to not need puppet/rails

fixes #2431 - handle fact uploads where host is missing $fqdn

Fixes #2501 - Allow my_hosts scope to include all subclasses of Host::Base

Fixes #2821 - Autoload paths, PowerManager children must be in namespace in order to autoload

fixes #2693 - don't cause handle_ca error when no Puppet CA associated with host

fixes #1770 - Refactored rdeckfacts definition to use facts_hash