Configure CI test cases timeouts

Set following default CI timeouts:
- 30 minutes for DevStack jobs
- 2 hours for IR plugin

Change-Id: I202bb5a6896817043b2514e591cc1ae37be7bf8f

infrared_plugin/plugin.spec

@@ -121,6 +121,10 @@ subparsers:
             help: enable/disable verbose log entries in tests results log file
             ansible_variable: test_log_debug
             default: yes
+          test-case-timeout:
+            type: Value
+            help: Test case timeout in seconds
+            ansible_variable: test_case_timeout
 
       - title: Run stage
         options:

roles/tobiko-configure/defaults/main.yaml

@@ -6,7 +6,12 @@ test_default_conf:
     log_dir: "{{ test_log_file | dirname }}"
     log_file: "{{ test_log_file | basename }}"
 
+  testcase:
+    timeout: "{{ test_case_timeout }}"
+
 test_log_debug: false
 
+test_case_timeout: 7200.
+
 # OpenStack client credentials
 stackrc_file: '{{ ansible_user_dir }}/overcloudrc'

zuul.d/devstack.yaml

@@ -70,6 +70,7 @@
         yaml: true
         yml: true
       test_log_debug: true
+      test_case_timeout: 1800
       tobiko_dir: '/opt/stack/tobiko'
       upper_constraints_file: '{{ ansible_user_dir }}/src/opendev.org/openstack/requirements/upper-constraints.txt'