The ansible-devel functional test intends to run against tip of ansible
devel. Let Zuul handle that and depends-on once cross-source depends
exist by listing ansible/ansible as a required-project.
Remove the special install handling, as tox-install-siblings should be
taking care of it now.
Change-Id: I93459ffc116f9106d9eb8000a7e5a58bea507308
Depends-On: Ib5e35315fc9ffe6fa8873ad4975309d9820e1feb
Depends-On: I6d234247e3d45befd264e159c8b0fe77f01c7fdc
d69288b1a2