Do not run openstacksdk-functional-devstack on wallaby

openstacksdk-functional-devstack job is broken on wallaby branch and
the fix [1] cannot be released as Wallaby is in Extended Maintenance
already. This patch removes the job from the integrated job template
as a workaround.

[1] https://review.opendev.org/872341

Change-Id: I578562e0d94d3cda4e9deb5fb44c3f674ab0628e
1 file changed