Skip BackgroundProcessTest tests when ha_faults are executed

When ha_faults tests are executed, overcloud nodes are rebooted,
affecting those tests that run background processes on VM instances or
against VM instances.
The goal of those tests is to run on other scopes, such as upgrades, ovs
to ovn migration, etc.

Change-Id: Ie31f9409a4fb5e8bc86991cf4511e155f5b80d71

roles/tobiko-run/vars/test-workflow-check-resources-faults.yaml

@@ -22,3 +22,4 @@ test_workflow_steps:
     tox_step_name: verify_resources
     tox_environment:
       TOBIKO_PREVENT_CREATE: yes
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"

roles/tobiko-run/vars/test-workflow-faults-neutron.yaml

@@ -12,6 +12,7 @@ test_workflow_steps:
     tox_step_name: create_neutron_resources
     tox_environment:
       TOBIKO_PREVENT_CREATE: no
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"
 
   - tox_description: 'run disruptive test cases (neutron)'
     tox_envlist: neutron_faults
@@ -34,3 +35,4 @@ test_workflow_steps:
     tox_step_name: verify_neutron_resources
     tox_environment:
       TOBIKO_PREVENT_CREATE: yes
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"

roles/tobiko-run/vars/test-workflow-faults.yaml

@@ -12,6 +12,7 @@ test_workflow_steps:
     tox_step_name: create_resources
     tox_environment:
       TOBIKO_PREVENT_CREATE: no
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"
 
   - tox_description: 'run disruptive test cases'
     tox_envlist: faults
@@ -31,3 +32,4 @@ test_workflow_steps:
     tox_step_name: verify_resources
     tox_environment:
       TOBIKO_PREVENT_CREATE: yes
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"

roles/tobiko-run/vars/test-workflow-gate.yaml

@@ -7,6 +7,7 @@ test_workflow_steps:
     tox_environment:
       TOBIKO_PREVENT_CREATE: no
     test_flaky: true
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"
 
   - tox_description: 'run sanity test cases before disruptive test cases'
     tox_envlist: sanity
@@ -35,3 +36,4 @@ test_workflow_steps:
     tox_environment:
       TOBIKO_PREVENT_CREATE: yes
     test_flaky: true
+    pytest_addopts: "--skipregex='BackgroundProcessTest'"