RedHat: RHSA-2019-4243-01 Important: Ansible Tower RHEL7 Security Fix

* Added a command to generate a new SECRET_KEY and rekey the database * Removed the guest user from the optionally-configured RabbitMQ admin interface (CVE-2019-19340) * Fixed slow queries for /api/v2/instances and /api/v2/instance_groups when smart inventories are used * Fixed assorted issues with preserving permissions in the Ansible Tower backup playbook (CVE-2019-19341) * Fixed a partial password disclosure when special characters existed in the RabbitMQ password (CVE-2019-19342) * Fixed hang in error handling for source control checkouts * Fixed an error on subsequent job runs that override the branch of a project on an instance that did not have a prior project checkout * Fixed an issue where supervisord would not shut down correctly * Fixed an issue where jobs launched in isolated or container groups would incorrectly timeout * Fixed link to instance groups documentation in the user interface * Fixed retrieval of Red Hat subscription data when running in OpenShift * Fixed editing of inventory on Workflow templates * Fixed multiple issues with OAuth2 token cleanup system jobs * Fixed custom email notifications for workflow approve and deny * Updated SAML implementation to automatically log if authorization exists * Updated AngularJS to 1.7.9 for CVE-2019-10768 * Updated installer to not install PostgreSQL server on all nodes * Updated bundled installer to contain both Red Hat Enterprise Linux 7 and 8 builds