Switch neutron-tempest-plugin-api job to be uwsgi based

Test of uwsgi based deployment is most important on the API
level, so this patch switches neutron-tempest-plugin-api job to
run neutron with uwsgi there.
Thanks to that we will also drop neutron-tempest-with-uwsgi
which is defined in the neutron repo from neutron CI queues.

Change-Id: If34ed0bd65a2eedae85894d80fb4f47eedef0165
7 files changed