Added tags to control execution of tasks

* Added tag to zuul specific tasks, so that it can be skipped
  when running the playbooks in local setup or in a 3rd party gate

Change-Id: If512eac4e0c5889a48e4aa98e357ca2ed1feefd8
Relates-To: #449

roles/airship-airshipctl-gather-configs/tasks/main.yaml

@@ -27,4 +27,5 @@
         src: "{{ airshipctl_config_dir }}"
         dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
         mode: pull
-      when: config_dir_stats.stat.exists
+      when: config_dir_stats.stat.exists
+      tags: [zuul]

roles/airship-gather-apache-logs/tasks/main.yaml

@@ -49,3 +49,4 @@
     dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
     mode: pull
   ignore_errors: True
+  tags: [zuul]

roles/airship-gather-libvirt-logs/tasks/main.yaml

@@ -109,3 +109,4 @@
         src: "{{ libvirt_log_dir }}"
         dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
         mode: pull
+      tags: [zuul]

roles/airship-gather-pod-logs/tasks/main.yaml

@@ -27,3 +27,4 @@
     dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
     mode: pull
   ignore_errors: True
+  tags: [zuul]

roles/airship-gather-runtime-logs/tasks/main.yaml

@@ -43,3 +43,4 @@
     src: "{{ runtime_logs_dir }}"
     dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
     mode: pull
+  tags: [zuul]

roles/describe-kubernetes-objects/tasks/main.yaml

@@ -81,4 +81,5 @@
     dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
     mode: pull
   ignore_errors: True
+  tags: [zuul]
 ...

roles/gather-system-logs/tasks/main.yaml

@@ -39,3 +39,4 @@
     dest: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
     mode: pull
   ignore_errors: True
+  tags: [zuul]

tools/gate/99_collect_logs.sh

@@ -25,4 +25,4 @@ PLAYBOOK_CONFIG=${PLAYBOOK_CONFIG:-"${TMP_DIR}/config.yaml"}
 
 sudo ansible-playbook -i "$ANSIBLE_HOSTS" \
 	playbooks/airship-collect-logs.yaml \
-	-e @"$PLAYBOOK_CONFIG"
+	-e @"$PLAYBOOK_CONFIG" --skip-tags zuul