Use length to avoid unsupported operations with '>'

The dev_install.yaml script breaks when running python 3 because of
unsupported comparisions between 'AnsibleUnsafeText' and 'int' with the
'>' operator.

This is very similar to a bug opened against ansible upstream [0]. We
can fix the issue by using length explicitly, which ensures we're
comparing integers to integers since we're dealing with a list.

[0] https://github.com/ansible/ansible/issues/50388

Change-Id: I100639982b75c9d345269ba9bf10defb7e96d774

tasks/dev_install.yml

@@ -33,7 +33,7 @@
   args:
     chdir: "{{ modify_dir_path }}"
   loop: "{{ refspecs }}"
-  when: item > 0
+  when: item | length > 0
 
 - name: Copy the Python directories into local temp dir
   command: "/bin/bash dev_install.sh {{ item }}"
@@ -42,6 +42,6 @@
   args:
     chdir: "{{ modify_dir_path }}"
   loop: "{{ python_dir }}"
-  when: item > 0
+  when: item | length > 0
 
 - include_tasks: modify_image.yml