install python-xml on SUSE/openSUSE only if python2 is installed

raw_install_python.yml: on SUSE/openSUSE, install python-xml package only
if python2 is installed already

Background:
On SLES 15.x / openSUSE Leap 15.x, the python2 package `python-base` provides
/usr/bin/python, while python3 only provides /usr/bin/python3.

Signed-off-by: Johannes Kastl <kastl@b1-systems.de>

raw_install_python.yml

@@ -56,3 +56,14 @@
       until: result is succeeded
       when: stat_zypper.rc == 0
   when: not True in (systempython.results | selectattr('stat', 'defined') | map(attribute='stat.exists') | list | unique)
+
+- name: install python-xml for opensuse only if python2 is installed already
+  raw: zypper -n install python-xml
+  register: result
+  until: result is succeeded
+  with_items: "{{ systempython.results }}"
+  when:
+    - stat_zypper.rc is defined
+    - stat_zypper.rc == 0
+    - item.stat.exists | bool
+    - item.stat.path == '/usr/bin/python'