Change nova-next tempest test regex

Before this change, nova-next ran the same tests
as the tempest-full job which was all non-slow API
and scenario tests.

To avoid running redundant tests on the same nova
change, this patch changes the tempest run regex
to run only compute API tests along with all
scenario tests and includes slow tests (by not
excluding them like tempest-full does).

By removing the non-compute API tests we should
still be able to keep this job running in a reasonable
time even though the slow tests are added.

As discussed in https://review.openstack.org/606978/,
test_volume_swap_with_multiattach will be run again
with this change since it otherwise won't run in
tempest-slow since that is a multi-node job and the
test was blocked from running in multi-node jobs until
bug 1807723 is fixed. In other words, this gives us
volume multi-attach testing of swap volumes again since
nova-next is a single-node job.

Change-Id: Icbc06849dfcc9f41c7aaf7de109e036a993de7c7

.zuul.yaml

@@ -173,7 +173,9 @@
       post-test scripts to ensure those scripts are still working,
       e.g. archive_deleted_rows. In Queens, this job started testing the
       TLS console proxy code in the libvirt driver.
-      Starting in Stein, the job was changed to run with python 3.
+      Starting in Stein, the job was changed to run with python 3 and enabled
+      volume multi-attach testing.
+      Runs all tempest compute API and scenario tests concurrently.
     run: playbooks/legacy/nova-next/run.yaml
     post-run: playbooks/legacy/nova-next/post.yaml
 

playbooks/legacy/nova-next/run.yaml

@@ -40,6 +40,7 @@
           NOVA_USE_SERVICE_TOKEN=True
           NOVA_CONSOLE_PROXY_COMPUTE_TLS=True
           USE_PYTHON3=True
+          ENABLE_VOLUME_MULTIATTACH=True
 
           [[post-config|$NOVA_CONF]]
           [compute]
@@ -59,9 +60,9 @@
           export PYTHONUNBUFFERED=true
           # Yes we want to run Tempest.
           export DEVSTACK_GATE_TEMPEST=1
-          # Run non-slow tempest API tests (concurrently) and scenario
-          # tests (serially).
-          export DEVSTACK_GATE_TEMPEST_FULL=1
+          # Run all compute API tests and all scenario tests at the default
+          # concurrency (nproc/2 which is normally 4 in the gate).
+          export DEVSTACK_GATE_TEMPEST_REGEX="^tempest\.((scenario)|(api\.compute))"
           # The post_test_hook runs some post-test CLIs for things that
           # Tempest does not test, like archiving deleted records.
           function post_test_hook {