Adds docker installation steps (#15)

installer/check_vars/tasks/check_openshift.yml

@@ -0,0 +1,49 @@
+# check_openshift.yml
+---
+- name: awx_openshift_project should be defined 
+  assert:
+    that:
+    - awx_openshift_project is defined and awx_openshift_project != ''
+    msg: "Set the value of 'awx_openshift_project' in the inventory file."
+
+- name: openshift_user should be defined 
+  assert:
+    that:
+    - openshift_user is defined and openshift_user != ''
+    msg: "Set the value of 'openshift_user' in the inventory file."
+
+- name: openshift_password should be defined 
+  assert:
+    that:
+    - openshift_password is defined and openshift_password != ''
+    msg: "Set the value of 'openshift_password' in the inventory file."
+
+- name: awx_node_port should be defined 
+  assert:
+    that:
+    - awx_node_port is defined and awx_node_port != ''
+    msg: "Set the value of 'awx_node_port' in the inventory file."
+
+- name: docker_registry should be defined 
+  assert:
+    that:
+    - docker_registry is defined and docker_registry != ''
+    msg: "Set the value of 'docker_registry' in the inventory file."
+
+- name: docker_registry_repository should be defined 
+  assert:
+    that:
+    - docker_registry_repository is defined and docker_registry_repository != ''
+    msg: "Set the value of 'docker_registry_repository' in the inventory file."
+
+- name: docker_registry_username should be defined 
+  assert:
+    that:
+    - docker_registry_username is defined and docker_registry_username != ''
+    msg: "Set the value of 'docker_registry_username' in the inventory file."
+
+- name: docker_registry_password should be defined 
+  assert:
+    that:
+    - docker_registry_password is defined and docker_registry_password != ''
+    msg: "Set the value of 'docker_registry_password' in the inventory file."