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

fixes #2747 - scoped search lambda takes one argument

fixes #1963 - prevent host creation when facts are uploaded via new setting

Fixes #2644 - Refactor Host find_by_name to use several ways to find a
host, and refactor my_hosts scope to Host::Base, allowing us to remove
unnecessary permissions check from find_by_name

fixes #1938 Foreman shouldn't use the FQDN fact to identify the node when facts are uploaded

Fixes #2632 - extract strings from validation errors