Fixes #10111 - Use a dummy primary interface for unmanaged hosts

Unmanaged hosts require a host interface due to delegation of networking
attributes, and some others like 'name'. Since unmanaged hosts do not
necessarily have an interface associated (unless created through puppet...

fixes #10020 - add next-server/filename attrs to provision NIC DHCP record

A host's DHCP record used to be constructed with PXE attributes in
Orchestration::DHCP, but moved to Nic::Managed during 43c4bd7. Nic::Managed
didn't add PXE attributes, so this commit adds these when provision? is set....

Fixes #10093 - VMware#create_vm calls clone_vm

Apply '.with_indifferent_access' to the args passed in to create_vm,
ensuring symbol test for args[:image_id] succeeds when args["image_id"]
is present.

(cherry picked from commit 140cfe262eac838e76eb27517bd0271beab9be15)

Fixes #9947 - restrict user taxonomies if none is set

(cherry picked from commit abe910f2a46f4ecc1f349263d0b4751ed46ff200)

Fixes #7615 - filter ignore current context

(cherry picked from commit 76fca93b0093e9b4174d1a888ffca9f3fcb886c9)

Fixes #9362 - Corrected CoreOS mediapath

(cherry picked from commit 9f858eb43200809f931321821880f1ae9ca9db54)

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 #10002 - Add attribute ancestry to taxonomies API v2

(cherry picked from commit 1f47202ce4e70fd036437f1d81646b6b811bf02d)

fixes #9778 - return r/w host when finding and associating to CRs

(cherry picked from commit cd4c4ad907fdadae66576f64831204711748bef3)

Fixes #9967 - make sure User.current is isolated

(cherry picked from commit fbbda1282c4ea4f17bd12132aa61f4a66832e8b8)