openstacksdk 1.0.0 was released 3½ years ago [1]. pip is not going to
pull that version any more. These checks are redundant.
In addition, we can remove sdk_version extra var. Change
I9665f04e6c0d5a84d6c20a73ef7b0dfdc7bd8159 removed the last guard that
relied on this, similarly about 3½ years ago.
[1] https://pypi.org/project/openstacksdk/1.0.0/
Change-Id: Ic0dd7bc5de1f24d1ee3336ccea97aced850f86af
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>