ansible: fixes for AIX (#2561)

Fixes a couple of errors introduced by #2539.

* ansible: fix mounting /aha on AIX

Mounting ahafs on AIX will fail if already mounted.

* ansible: fix syntax error in tap2junit/aix.yml

ansible/roles/bootstrap/tasks/partials/aix.yml

@@ -43,14 +43,17 @@
 # This is to mount the AIX file event infrastructure to get the file watcher tests passing
 
 - name: check for /aha filesystem
-  stat:
-    path: /aha
+  ansible.builtin.find:
+    file_type: any
+    paths: /aha
   register: ahafs
 
 - name: create /aha filesystem
-  when: ahafs.stat.exists == false
-  raw: mkdir /aha
+  ansible.builtin.file:
+    path: /aha
+    state: directory
 
 - name: Mount /aha filesystem
   shell:
     cmd: mount -v ahafs /aha /aha
+  when: ahafs.matched == 0

ansible/roles/jenkins-worker/tasks/partials/tap2junit/aix.yml

@@ -17,11 +17,11 @@
 
 - name: install pip AIX71
   raw: /usr/bin/python /home/iojs/get-pip.py
-  when: pip_exists.stat.exists == False && os == "aix71"
+  when: pip_exists.stat.exists == False and os == "aix71"
 
 - name: install pip AIX72
   raw: /opt/bin/python3 /home/iojs/get-pip.py
-  when: pip_exists.stat.exists == False && os == "aix72"
+  when: pip_exists.stat.exists == False and os == "aix72"
 
 - name: create symbolic link AIX71
   file: