tripleo-ci-centos-7-standalone-os-tempest was added while porting
tripleo ci jobs to os_tempest and now the porting is done.
tripleo-ci-centos-7-standalone-os-tempest and
tripleo-ci-centos-7-standalone are the same job, It replaces the
existing os_tempest job to plain tripleo standalone job to keep
consistency at all places.
Change-Id: I6b987329a55487193d2101b2f3cea7c36eaa7bbc
Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com>