Merge OracleLinux in RedHat bootstrap-os (#5575)

* Merge OracleLinux in RedHat bootstrap-os

* Set default for use_oracle_public_repo in main.yaml

roles/bootstrap-os/tasks/bootstrap-centos.yml

@@ -1,4 +1,27 @@
 ---
+# For Oracle Linux install public repo
+- name: Download Oracle Linux public yum repo
+  get_url:
+    url: https://yum.oracle.com/public-yum-ol7.repo
+    dest: /etc/yum.repos.d/public-yum-ol7.repo
+  when:
+    - use_oracle_public_repo|default(true)
+    - '"Oracle" in os_release.stdout'
+
+- name: Enable Oracle Linux repo
+  ini_file:
+    dest: /etc/yum.repos.d/public-yum-ol7.repo
+    section: "{{ item }}"
+    option: enabled
+    value: "1"
+  with_items:
+    - ol7_latest
+    - ol7_addons
+    - ol7_developer_EPEL
+  when:
+    - use_oracle_public_repo|default(true)
+    - '"Oracle" in os_release.stdout'
+
 # CentOS ships with python installed
 
 - name: Check if this is an atomic host