Upgrade flavor for Fedora VM

Since we bumped Fedora version used in CI from 36 to 37, we've
seen timeout during boot process more frequently, which results
in job failure. This increases core and ram assigned to Fedora
VMs, to reduce failure rate.

To avoid consuming too much resources, this limits concurrency
of test runner.

Change-Id: I12e8ee0861629fd42a6bd03ec8705751da12ff61

devstack/lib/heat

@@ -457,7 +457,7 @@ function configure_tempest_for_heat {
     fi
     iniset $TEMPEST_CONFIG heat_plugin skip_functional_test_list $SKIP_FUNCTIONAL_TEST_LIST
 
-    openstack flavor show m1.heat_int || openstack flavor create m1.heat_int --ram 512 --disk 10
+    openstack flavor show m1.heat_int || openstack flavor create m1.heat_int --ram 1024 --vcpus 2 --disk 10
     openstack flavor show m1.heat_micro || openstack flavor create m1.heat_micro --ram 128 --disk 1
 
     export OS_CLOUD=devstack

devstack/upgrade/resources.sh

@@ -95,7 +95,7 @@ function _run_heat_integrationtests {
     tox -evenv-tempest -- pip install -c$UPPER_CONSTRAINTS_FILE $HEAT_TEMPEST_PLUGIN
     tox -evenv-tempest -- stestr --test-path=$DEST/heat/heat_integrationtests --top-dir=$DEST/heat \
         --group_regex='heat_tempest_plugin\.tests\.api\.test_heat_api[._]([^_]+)' \
-        run --include-list $UPGRADE_TESTS
+        run --concurrency=4 --include-list $UPGRADE_TESTS
     _heat_set_user
     popd
 }

roles/run-heat-tests/tasks/main.yaml

@@ -29,7 +29,8 @@
 - name: Run heat tests
   command: tox -evenv-tempest -- stestr --test-path={{devstack_base_dir}}/heat/heat_integrationtests \
             --top-dir={{devstack_base_dir}}/heat \
-            --group_regex='heat_tempest_plugin\.tests\.api\.test_heat_api[._]([^_]+)' run
+            --group_regex='heat_tempest_plugin\.tests\.api\.test_heat_api[._]([^_]+)' \
+            run --concurrency 4
   args:
     chdir: "{{devstack_base_dir}}/tempest"
   become: true