Fix defaults for environment variable lookups

The env lookup plugin returns None if the environment variable is not
defined, which does not count as undefined. This means the default filter
will not replace the value. We pass true as the second argument to default
in order to interpret the value as a boolean when determining if it is
defined.

ansible/group_vars/all/globals

@@ -5,10 +5,10 @@
 # Path configuration.
 
 # Path to Kayobe configuration directory.
-kayobe_config_path: "{{ lookup('env', 'KAYOBE_CONFIG_PATH') | default('/etc/kayobe') }}"
+kayobe_config_path: "{{ lookup('env', 'KAYOBE_CONFIG_PATH') | default('/etc/kayobe', true) }}"
 
 # Path in which to store data locally.
-base_path: "{{ lookup('env', 'KAYOBE_BASE_PATH') | default('/opt/kayobe') }}"
+base_path: "{{ lookup('env', 'KAYOBE_BASE_PATH') | default('/opt/kayobe', true) }}"
 
 # Path in which to cache downloaded images.
 image_cache_path: "{{ base_path ~ '/images' }}"

ansible/group_vars/all/kolla

@@ -26,7 +26,7 @@ kolla_venv: "{{ virtualenv_path ~ '/kolla' }}"
 # Kolla configuration.
 
 # Path to Kolla configuration directory.
-kolla_config_path: "{{ lookup('env', 'KOLLA_CONFIG_PATH') | default('/etc/kolla') }}"
+kolla_config_path: "{{ lookup('env', 'KOLLA_CONFIG_PATH') | default('/etc/kolla', true) }}"
 
 # Path to Kolla node custom configuration directory.
 kolla_node_custom_config_path: "{{ kolla_config_path }}/config"