undercloud-setup: fixed two runtime warnings

Non fatal but confusing and avoidable error:
/bin/sh: /etc/ci/mirror_info.sh: No such file or directory

[DEPRECATION WARNING]: Invoking "pip" only once while using a loop via
squash_actions is deprecated. Instead of using a loop to supply multiple items
and specifying `name: "{{ item }}"`, please use `name: ['pip', 'setuptools']`
and remove the loop. This feature will be removed in version 2.11. Deprecation
warnings can be disabled by setting deprecation_warnings=False in ansible.cfg

Change-Id: I1495dd11405613b7ca63e81cfec8c3eead2dbece

roles/undercloud-setup/tasks/ansible_cfg.yml

@@ -4,11 +4,10 @@
 - name: Install ara deps
   become: true
   pip:
-    name: "{{ item }}"
+    name:
+      - pip
+      - setuptools
     state: latest
-  with_items:
-    - pip
-    - setuptools
   # TODO(sshnaidm): https://bugs.launchpad.net/tripleo/+bug/1792622
   ignore_errors: true
 

roles/undercloud-setup/tasks/atop.yml

@@ -6,7 +6,9 @@
     # Run atop in background
     - name: Install atop if configured so
       shell: |
-        source /etc/ci/mirror_info.sh
+        if [ -e /etc/ci/mirror_info.sh ]; then
+          source /etc/ci/mirror_info.sh
+        fi
         atop_location=$(repoquery --repoid=osepel --repofrompath=osepel,$NODEPOOL_EPEL_MIRROR/7/x86_64/ --location atop)
         {{ ansible_pkg_mgr }} install -y $atop_location