Some configuration options were accepting both IP addresses
and hostnames. Since there was no specific OSLO opt type to
support this, we were using ``StrOpt``. The change [1] that
added support for ``HostAddressOpt`` type was merged in Ocata
and became available for use with oslo version 3.22.
This patch changes the opt type of configuration options to use
this more relevant opt type - HostAddressOpt.
[1] I77bdb64b7e6e56ce761d76696bc4448a9bd325eb
Change-Id: I587ae3ee639bb7dc33f338a6ae224fa8e2b2d7fb