This bug was introduced by below commit
d3164c63dc
The update after PATCH SET 10 will cause the second mariadb could not
join cluster. In this case, could not set bind_address=:: for ipv4. It
only works for ipv6.

As for conf.database.config_override, we can override it through
system helm-override-update command, but could not use python
plugin to dynamically override it as it will introduce a "-|" line
in first line of config file.
A user override for conf.database.config_override might break the IPv6
system overrides, it need including ipv6 config for ipv6 case as well.

Test pass on duplex setup. Openstack application applied successfully.

Closes-Bug: 1886003

Change-Id: I23c2fb6a7c8b5a38af1e046894d5fae247df2d6f
Signed-off-by: Zhipeng Liu <zhipengs.liu@intel.com>