Update rhsm_disable_container_check default value

Following [1], the right way to disable the feature is to set the env
var value to an empty string.
Until now, whatever the value was (even False), it was enabled, because
the var was in the env.

[1] https://github.com/candlepin/subscription-manager/pull/3097

Change-Id: I54e1452dc4bb6e2e25fa9567335b62b730000e83

tasks/portal.yml

@@ -22,7 +22,7 @@
             server_proxy_password: "{{ rhsm_rhsm_proxy_password | default(omit) }}"
           register: subscrition_result
           environment:
-            SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check | bool }}"
+            SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check }}"
           tags:
             - rhsm
             - rhsm_register
@@ -31,7 +31,7 @@
         - name: Clean all local subscription data
           command: subscription-manager clean
           environment:
-            SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check | bool }}"
+            SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check }}"
 
         - import_tasks: register.yml
 

tasks/register.yml

@@ -17,7 +17,7 @@
     server_proxy_password: "{{ rhsm_rhsm_proxy_password | default(omit) }}"
   register: subscrition_result
   environment:
-    SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check | bool }}"
+    SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check }}"
   tags:
     - rhsm
     - rhsm_register

tasks/satellite-6.yml

@@ -41,5 +41,5 @@
 - name: SATELLITE 6 | Execute katello-rhsm-consumer
   shell: katello-rhsm-consumer
   environment:
-    SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check | bool }}"
+    SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check }}"
   when: katello_rpm.changed

tasks/unregister.yml

@@ -1,7 +1,7 @@
 - name: Unregister Red Hat subscription
   command: subscription-manager remove --all
   environment:
-    SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check | bool }}"
+    SMDEV_CONTAINER_OFF: "{{ rhsm_disable_container_check }}"
   become: true
   tags:
     - rhsm_unregister

vars/main.yml

@@ -1,6 +1,6 @@
 rhsm_repo_ca_cert: "{{ '%(ca_cert_dir)s' ~ ('katello-server-ca.pem' if rhsm_method == 'satellite' else 'redhat-uep.pem') }}"
 rhsm_full_refresh_on_yum: "{{ 1 if rhsm_method == 'satellite' else 0 }}"
-rhsm_disable_container_check: false
+rhsm_disable_container_check: ''
 rhsm_yum_plugins:
   - file: product-id.conf
     option: enabled