Drop testing with PostgreSQL

neutron completely removed its code to support PostgreSQL by [1].
Switch the testing coverage to use mysql instead, even in stable
branches, because any problems are not likely to be fixed.

[1] https://review.opendev.org/c/openstack/neutron/+/934171

Change-Id: I9bde4b20212d6111a75d91059f8e983d86ba9b59
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
diff --git a/zuul.d/manila-tempest-jobs.yaml b/zuul.d/manila-tempest-jobs.yaml
index 0f4ebc8..7871598 100644
--- a/zuul.d/manila-tempest-jobs.yaml
+++ b/zuul.d/manila-tempest-jobs.yaml
@@ -114,7 +114,7 @@
 - job:
     name: manila-tempest-plugin-zfsonlinux-base
     abstract: true
-    description: Test ZFSOnLinux multibackend (DHSS=False) with postgresql db
+    description: Test ZFSOnLinux multibackend (DHSS=False)
     parent: manila-tempest-plugin-base
     vars:
       tempest_test_regex: '(^manila_tempest_tests.tests)(?=.*\[.*\bbackend\b.*\])'
@@ -132,9 +132,6 @@
         MANILA_ZFSONLINUX_SERVICE_IP: 127.0.0.1
         MANILA_ZFSONLINUX_USE_SSH: true
         MANILA_USE_SCHEDULER_CREATING_SHARE_FROM_SNAPSHOT: true
-      devstack_services:
-        mysql: false
-        postgresql: true
       devstack_local_conf:
         test-config:
           $TEMPEST_CONFIG:
@@ -160,7 +157,7 @@
 
 - job:
     name: manila-tempest-plugin-zfsonlinux
-    description: Test ZFSOnLinux multibackend (DHSS=False) with postgresql db
+    description: Test ZFSOnLinux multibackend (DHSS=False)
     parent: manila-tempest-plugin-zfsonlinux-base
     # https://bugs.launchpad.net/manila/+bug/2087192
     nodeset: openstack-single-node-jammy
@@ -261,8 +258,8 @@
 - job:
     name: manila-tempest-plugin-container
     description: |
-      Test the container driver multibackend (DHSS=True) with CIFS
-      and postgresql db. API only, in a minimal devstack
+      Test the container driver multibackend (DHSS=True) with CIFS.
+      API only, in a minimal devstack
     parent: manila-tempest-plugin-base
     vars:
       tempest_test_regex: manila_tempest_tests.tests.api
@@ -280,9 +277,6 @@
         MANILA_CONFIGURE_DEFAULT_TYPES: false
         MANILA_DEFAULT_SHARE_TYPE_EXTRA_SPECS: 'snapshot_support=false'
         TEMPEST_USE_TEST_ACCOUNTS: false
-      devstack_services:
-        mysql: false
-        postgresql: true
       devstack_local_conf:
         test-config:
           $TEMPEST_CONFIG:
diff --git a/zuul.d/manila-tempest-stable-jobs.yaml b/zuul.d/manila-tempest-stable-jobs.yaml
index e049003..5ef0042 100644
--- a/zuul.d/manila-tempest-stable-jobs.yaml
+++ b/zuul.d/manila-tempest-stable-jobs.yaml
@@ -57,7 +57,7 @@
 
 - job:
     name: manila-tempest-plugin-zfsonlinux-stable
-    description: Test ZFSOnLinux multibackend (DHSS=False) with postgresql db
+    description: Test ZFSOnLinux multibackend (DHSS=False)
     parent: manila-tempest-plugin-zfsonlinux-base
     branches: *manila_tempest_image_pinned_branches
     vars: *manila_tempest_image_pinned_vars