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: I98d7a44fec4b3b4ba1cf431ac01159da0418f54d
Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com>