test-prepare-host: Switch package state to 'present' on openSUSE

Similar to the CentOS case, we should use 'present' instead of 'latest'
for the package state so we don't spend time resolving dependencies,
querying repos etc. The 'present' state can be further improved either
in the zypper itself or in the Ansible module.

Change-Id: I44fae44030af1c9ee88dcc26c6b55c91a2531926
Link: https://github.com/ansible/ansible/pull/37191
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1084525
(cherry picked from commit 1f2ab67987)

test-prepare-host.yml

@@ -42,12 +42,12 @@
       with_items:
         - "91.189.91.21 images.linuxcontainers.org us.images.linuxcontainers.org"
         - "91.189.88.37 images.linuxcontainers.org uk.images.linuxcontainers.org"
-    # NOTE(mhayden): Using package_state=present on CentOS 7 should allow for
+    # NOTE(mhayden): Using package_state=present on CentOS or openSUSE should allow for
     # more gate jobs to complete properly and expose more problems that can
     # be fixed (instead of timeouts).
-    - name: Use present for package_state on CentOS 7
+    - name: Use present for package_state on CentOS and openSUSE
       set_fact:
-        package_state: "{{ (ansible_os_family == 'RedHat') | ternary('present', 'latest') }}"
+        package_state: "{{ (ansible_pkg_mgr in ['dnf', 'yum', 'zypper']) | ternary('present', 'latest') }}"
 
 - include: test-install-openstack-hosts.yml