Adjust integrated-storage-import jobs

We have to address two issues simultaneously:

1. handle multiple cirros images

   The change[1] configures multiple images for the devstack-tempest
   job and all the jobs deriving from it. This causes problem with
   the current post-check-metadata-injection.yaml playbook since
   we only expect one cirros image and perform steps accordingly.
   This change modifies the playbook to handle multiple cirros
   images.
   Failure in the glance-multistore-cinder-import job can be
   seen here[2].

   [1] https://review.opendev.org/c/openstack/tempest/+/831018
   [2] https://zuul.opendev.org/t/openstack/build/68a4d3ec6ce04c87b21d73a333f5b5cd/log/job-output.txt#23161

   This was change I70b4a970d7e1.

2. change the the job config to address resource constraints
   * partial backport of I073216d1bbdd to change swap size
     (we don't include the change from that patch that was needed
     to address changes in Bobcat-era devstack)
   * backporting Ieb96eb6ceb6f to change tempest concurrency

Change-Id: I6cd5b8bbf39f0cfae466f0800faea5a74e960e69

.zuul.yaml

@@ -206,6 +206,8 @@
       The regular tempest-integrated-storage job but with glance metadata injection
     post-run: playbooks/post-check-metadata-injection.yaml
     vars:
+      configure_swap_size: 8192
+      tempest_concurrency: 3
       zuul_copy_output:
         /etc/glance-remote: logs
       devstack_localrc:

playbooks/post-check-metadata-injection.yaml

@@ -9,12 +9,16 @@
           set -xe
           cirrosimg=$(glance image-list | grep cirros | cut -d" " -f 2)
 
-          echo "Dumping the cirros image for debugging..."
-          glance image-show $cirrosimg
+          # There could be more than one cirros image so traverse through the list
+          for image in $cirrosimg
+          do
+              echo "Dumping the cirros image for debugging..."
+              glance image-show $image
 
-          echo "Checking that the cirros image was decorated with metdata on import..."
-          glance image-list --property-filter 'glance_devstack_test=doyouseeme?' | grep cirros
+              echo "Checking that the cirros image was decorated with metdata on import..."
+              glance image-list --property-filter 'glance_devstack_test=doyouseeme?' | grep $image
 
-          echo "Checking that the cirros image was converted to raw on import..."
-          glance image-show $cirrosimg | egrep -e 'disk_format.*raw'
+              echo "Checking that the cirros image was converted to raw on import..."
+              glance image-show $image | egrep -e 'disk_format.*raw'
+          done
       environment: '{{ zuul | zuul_legacy_vars }}'