playbookconfig: validate-config: update dict.keys()[0]

All '<dict>.keys()[0]' in yaml files should be updated to '<dict>.keys()|list|first'
after upgrading to Python3.
In Python2, the dict.keys(),dict.values(),dict.items() returns a list,
but in Python3, these methods return a dictionary view object.
The reported error message is:
"The task includes an option with an undefined variable.\
The error was: dict_keys object has no element 0"

Story: 2008454
Task: 41441

Signed-off-by: Haiqing Bai <haiqing.bai@windriver.com>
Change-Id: I7e41244759cffaa734e36a9d4d35478f21c96f83
(cherry picked from commit 816c028277)

playbookconfig/src/playbooks/roles/bootstrap/bringup-bootstrap-applications/tasks/upload_and_apply_application.yml

@@ -14,7 +14,7 @@
 # extract the name of the tar file
 - name: Set application tar name
   set_fact:
-    current_application_tar_name: "{{ application.keys()[0].split('/')[-1] }}"
+    current_application_tar_name: "{{ (application.keys()|list|first).split('/')[-1] }}"
 
 # we assume the application tarball comes from a build and have the following format
 # application-name-version.tgz where version is x.y-z
@@ -31,7 +31,7 @@
 - block:
   - name: Upload application
     shell: "source /etc/platform/openrc;
-            system application-upload {{ application.keys()[0] }}"
+            system application-upload {{ application.keys()|list|first }}"
     when: check_exist.stdout == ""
 
   - name: Wait until application is in the uploaded state
@@ -45,10 +45,10 @@
   - name: Apply overrides for application
     shell: "source /etc/platform/openrc; system helm-override-update {{ current_application_name }}
             {{ override_item['chart'] }} {{ override_item['namespace'] }} --values {{ override_item['values-path'] }}"
-    loop: "{{ application[application.keys()[0]]['overrides'] }}"
+    loop: "{{ application[application.keys()|list|first]['overrides'] }}"
     loop_control:
       loop_var: override_item
-    when: application[application.keys()[0]] and "overrides" in application[application.keys()[0]]
+    when: application[application.keys()|list|first] and "overrides" in application[application.keys()|list|first]
 
   - name: Apply application
     shell: "source /etc/platform/openrc; system application-apply {{ current_application_name }}"

playbookconfig/src/playbooks/roles/bootstrap/validate-config/tasks/main.yml

@@ -606,7 +606,7 @@
 
 - name: Append applications to application list
   set_fact:
-    all_applications: "{{ all_applications }} + [ '{{ item.keys()[0] }}' ]"
+    all_applications: "{{ all_applications }} + [ '{{ item.keys()|list|first }}' ]"
   with_items: "{{ applications }}"
 
 - name: Get the name of the nginx tarball

playbookconfig/src/playbooks/roles/bootstrap/validate-config/tasks/validate_application.yml

@@ -24,7 +24,7 @@
 # extract the name of the tar file
 - name: Set application tar name
   set_fact:
-    current_application_tar_name: "{{ application.keys()[0].split('/')[-1] }}"
+    current_application_tar_name: "{{ (application.keys()|list|first).split('/')[-1] }}"
 
 - name: Fail if the application tarfile is not a valid type
   fail:
@@ -33,17 +33,17 @@
 
 - name: Check appication tarfile status
   stat:
-    path: "{{ application.keys()[0] }}"
+    path: "{{ application.keys()|list|first }}"
   register: tarball_stat
 
 - name: Fail if the application tarfile doesn't exist
   fail:
-    msg: "{{ application.keys()[0] }} doesn't exist"
+    msg: "{{ application.keys()|list|first }} doesn't exist"
   when: not tarball_stat.stat.exists
 
 - name: Fail if the provided application tarfile is a directory
   fail:
-    msg: "{{ application.keys()[0] }} is a directory"
+    msg: "{{ application.keys()|list|first }} is a directory"
   when: tarball_stat.stat.exists and tarball_stat.stat.isdir
 
 - name: Fail if overrides config is incomplete
@@ -52,19 +52,19 @@
   failed_when: '"chart" not in override_item or
                 "namespace" not in override_item or
                 "values-path" not in override_item'
-  loop: "{{ application[application.keys()[0]]['overrides'] }}"
+  loop: "{{ application[application.keys()|list|first]['overrides'] }}"
   loop_control:
     loop_var: override_item
-  when: (application[application.keys()[0]]) and
-        ("overrides" in application[application.keys()[0]])
+  when: (application[application.keys()|list|first]) and
+        ("overrides" in application[application.keys()|list|first])
 
 - name: Fail if overrides file does not exist
   stat:
     path: "{{ override_item['values-path'] }}"
   register: override_stat
   failed_when: not override_stat.stat.exists
-  loop: "{{ application[application.keys()[0]]['overrides'] }}"
+  loop: "{{ application[application.keys()|list|first]['overrides'] }}"
   loop_control:
     loop_var: override_item
-  when: (application[application.keys()[0]]) and
-        ("overrides" in application[application.keys()[0]])
+  when: (application[application.keys()|list|first]) and
+        ("overrides" in application[application.keys()|list|first])