Fixes #8812 - Pass model type so search_for is called on Host

At least on version 1.6.1, the absence of this second parameter leads to a
runtime crash when it's time to validate if the current user (non-admin) is
allowed to perform a power operation on given a host via the APIv2....

Fixes #9921 - specify requirements on apidoc params for NICs

(cherry picked from commit e404a0fa999b995fea3b7222611fa852b26fb6f8)

Fixes #8890 - Allow selection of plaintext "encryption" method for root password

(cherry picked from commit 331ff165939399787022e77ad17778e2ac39c148)

Fixes #7378 - fixed API lookup keys filters

(cherry picked from commit bc68c48da5b718084c3e531e61e48124e8e00d36)

refs #9877 - s/variable/class parameter/ on param :override

(cherry picked from commit 00c41428f08d427eb41c041e9bf8bb2eeac26bfc)

fixes #9877 - Add descriptions to smart_class_parameters in api/v2

(cherry picked from commit f43531494ef29c26081ece9c6ab1caea8c9fa08e)

fixes #9823 - Add description to smart variables

(cherry picked from commit b8239e44dfdd9bf924758f2dd179018a9b9f4d4a)

Fixes #9723 - missing owner_type in host api docs

(cherry picked from commit 55be35e9699765bb5fb137db518b06411be20939)

Fixes #9657 - merge NICs from compute profile in host create API

- updated api docs for hosts and interfaces
- host create/update api actions now merge interfaces from compute
profiles
- NIC type mapping extracted into a separate class
- return full host detail after host update...

Fixes #9678 - Can't update admin flag for users via API

find_resource needs to be defined prior to UsersMixin is included as it
requires the variable @user being set.

(cherry picked from commit 1b1b39861e485523b0cc0c6435fef30c38df7e07)