Revert "Raise minimum OpenStack SDK version to 0.99.0"

This reverts commit 4bfa135b [1] because
it broke TripleO [2] and possibly other users which were using code from
master branch with incompatible SDK releases. We will reapply this
safety check later once dust has settled.

Ref.:
[1] https://opendev.org/openstack/ansible-collections-openstack/commit/4bfa135b20caeb6d6c2717049059ac52fd08e0e1
[2] https://bugs.launchpad.net/tripleo/+bug/1975646

Change-Id: I637f1b7c1b792adf6d3d17a27ccb42179f56a83b