Fixes #14701: Mention image password in API docs and tests

Setting the image password is well supported but not documented.

Fixes #14927 - correct override value requirment

override value should only be required when use_puppet_default is false

Fixes #14934 - Remove rails 3.2 workaround from parameter model

Fixes #14746 - Template kinds translated
in provisioning template form dropdown

Fixes #14795 - User w/o edit_params permission can save host

Some puppet class parameter fields were not disabled for users without
the `edit_params` permission, leading to errors when attempting to save
a host with overriden parameters.

Fixes #14079 - display_link_if_authorized not hidden when disabled

Fixes #6977 - default PXE menu's labels are sorted

fixes #14855 - hide template type dropdown when snippet checked

Fixes #14726 - disabled delete button in interfaces doesn't delete

fixes #14864 - show link to subnet in host nic info