This patch adds `pgHealthyRegex` field to DisruptionManagementSpec.
`pgHealthyRegex` is a regular expression that is used to determine which
PG states should be considered healthy. The default value of
`pgHealthyRegex` is:
^(active\+clean|active\+clean\+scrubbing|active\+clean\+scrubbing\+deep)$
which is effectively the same as before.
Signed-off-by: Ryotaro Banno <ryotaro.banno@gmail.com>
(cherry picked from commit 0ad88e9d68)