This will fail due to overly restrictive regex validation:
cinder manage hostgroup@cloud#[dead:beef::cafe]:/cinder01 abcd
This is because validation for this call checks for a valid
hostname but needs to check for any string that would be a valid
"host" in Cinder, which is not the same thing.
Closes-Bug: #1904892
Change-Id: I1349e8d3eb422f9dcd533c54f922f7ab8133b753