Using import for conditional tasks cause them to be loaded and
each tasks recorded as skipped. This consumes execution time and
can be easily avoided using dynamic includes.
While this behavior was reverted before [1] due to
tags mis-behavior, we learned how to deal with
tags applied to dynamic includes.
[1] https://review.opendev.org/c/openstack/openstack-ansible-os_keystone/+/665139
Change-Id: I29c79755a091bb1992b82a97fc6fa3fb33531edf
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>