Support the operations of create/delete prestage orchestration strategy
on Horizon.
Test Plan:
PASS: Successfully create and apply prestage strategy with specified
21.12/22.12 release.
PASS: Successfully create and apply prestage strategy with 22.12 release
(the system controller active release) when the release field
is absent.
PASS: Successfully abort or delete the prestage strategy.
PASS: Verify no broken functionalities of existing orchestration
strategies.
Story: 2010611
Task: 48144
Change-Id: Ia560e6b9e8f3fa8f27e9864b204335cd0c6935f1
Signed-off-by: lzhu1 <li.zhu@windriver.com>
42f6086bea