[stable-2.7] Update tests to use RHEL 7.8. (#68787)

* Update tests to use RHEL 7.8.

Keeping support for RHEL 7.6 since collections are still using it.

* Fix tests for RHEL 7.7+ due to extras repo name change..
(cherry picked from commit 04edd77c42)

Co-authored-by: Matt Clay <mclay@redhat.com>

changelogs/fragments/ansible-test-rhel-7.8.yml

@@ -0,0 +1,2 @@
+minor_changes:
+    - ansible-test now supports testing against RHEL 7.8 when using the ``--remote`` option.

shippable.yml

@@ -42,7 +42,7 @@ matrix:
     - env: T=network
 
     - env: T=osx/10.11/1
-    - env: T=rhel/7.6/1
+    - env: T=rhel/7.8/1
     - env: T=freebsd/11.1/1
     - env: T=linux/centos6/1
     - env: T=linux/centos7/1
@@ -54,7 +54,7 @@ matrix:
     - env: T=linux/ubuntu1804/1
 
     - env: T=osx/10.11/2
-    - env: T=rhel/7.6/2
+    - env: T=rhel/7.8/2
     - env: T=freebsd/11.1/2
     - env: T=linux/centos6/2
     - env: T=linux/centos7/2
@@ -66,7 +66,7 @@ matrix:
     - env: T=linux/ubuntu1804/2
 
     - env: T=osx/10.11/3
-    - env: T=rhel/7.6/3
+    - env: T=rhel/7.8/3
     - env: T=freebsd/11.1/3
     - env: T=linux/centos6/3
     - env: T=linux/centos7/3

test/integration/targets/setup_docker/tasks/RedHat-7.yml

@@ -11,7 +11,8 @@
     name: https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
 
 - name: Enable extras repository for RHEL on AWS
-  command: yum-config-manager --enable rhui-REGION-rhel-server-extras
+  # RHEL 7.6 uses rhui-REGION-rhel-server-extras and RHEL 7.7+ use rhui-rhel-7-server-rhui-extras-rpms
+  command: yum-config-manager --enable rhui-REGION-rhel-server-extras rhui-rhel-7-server-rhui-extras-rpms
   args:
     warn: no
 

test/runner/completion/remote.txt

@@ -1,3 +1,4 @@
 freebsd/11.1
 osx/10.11
 rhel/7.6
+rhel/7.8