Fixes the microversion comparison in both enable and
disable nova-compute service methods in NovaHelper.
The previous implementation was incorrect and started to
fail for microversion greather than 2.99.
Closes-Bug: #2120586
Assisted-By: Cursor (claude-4-sonnet)
Change-Id: I69da7f10cd5b42f7d4613d8947bca3e382815c3f
Signed-off-by: Douglas Viroel <viroel@gmail.com>
