fixes #5450 - add realm to params for 1.4-compatible use in templates

(cherry picked from commit 77d9d699b32e735e4b70195e978de108a992d3f5)

fixes #5444 - add param_false? host method and allow in templates

(cherry picked from commit 6807d4230015c341531dc88aae513719aa2ba92f)

fixes #5246 - remove second host/class lookup impl so config groups are included in ENC output

(cherry picked from commit 46b3d8f1f5dff70b961266232f0041beabea8e0d)

fixes #4204 - add config groups feature - assign multiple config groups to a host or hostgroup

fixes #5053 - minor bug fixes to realm integration

fixes #4381: dns records are being update after changes to host when dhcp is also present

Fixes #4976 - ensure the process is really running inside a rake task

fixes #1809 - foreman realm integration

fixes #1966 - improved UI errors for proxy

fixes #3214 - set taxonomy for hosts created via Puppet from facts or a default setting