tasks: horizon_install: Fix virtualenv-tools issue on openSUSE

openSUSE is also suffering from the same virtualenv-tools issue so
we need to remove the existing python-2.7 symlink.

Link: fireteam/virtualenv-tools#5
Related-Bug: #1637509
Partial-Bug: #1644629
Change-Id: Ie3f4355eb53db563aaf5fa71d1ea9fb2ee5cfe32
(cherry picked from commit 91171e2)

tasks/horizon_install.yml

@@ -142,12 +142,12 @@
   delay: 2
   when: horizon_optional_pip_packages | length > 0
 
-- name: CentOS remove python from path first
+- name: Remove python from path first (CentOS, openSUSE)
   file:
     path:  "{{ horizon_bin | dirname }}/bin/python2.7"
     state: "absent"
   when:
-    - ansible_pkg_mgr in ['yum', 'dnf']
+    - ansible_pkg_mgr in ['yum', 'dnf', 'zypper']
     - horizon_get_venv | changed
 
 - name: Update virtualenv path