Fix issue with nginx container not restarting on reboot (#4642)

This changes it to use /var/tmp instead of the more volatile /tmp

* Adjust tmp path based on platform.

Co-authored-by: Rodric Rabbah <rodric@gmail.com>
diff --git a/ansible/environments/local/group_vars/all b/ansible/environments/local/group_vars/all
index d8f93f1..b8e390c 100644
--- a/ansible/environments/local/group_vars/all
+++ b/ansible/environments/local/group_vars/all
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-openwhisk_tmp_dir: "{{ lookup('env', 'OPENWHISK_TMP_DIR')|default('/tmp', true) }}"
+openwhisk_tmp_dir: "{{ lookup('env', 'OPENWHISK_TMP_DIR')|default('/tmp' if ansible_distribution == 'MacOSX' else '/var/tmp', true) }}"
 config_root_dir: "{{ openwhisk_tmp_dir }}/wskconf"
 whisk_logs_dir: "{{ openwhisk_tmp_dir }}/wsklogs"
 coverage_enabled: "{{ lookup('env', 'GRADLE_COVERAGE') | default('false', true) | bool}}"