Remove get_md5 parameter from stat module.

The get_md5 parameter was removed with ansible 9.
https://docs.ansible.com/ansible/latest/porting_guides/porting_guide_9.html#id44

If it is being used the following error appears:
"Unsupported parameters for (stat) module: get_md5..."

Unrelated, but also blocking testing/merging of this change, the
Ansible version specs for older python versions is loosened
to allow installing older versions of Ansible on test nodes (like
focal) that have older pythons that are unsupported by newer Ansible.

Change-Id: I99dd4f16fde659d84eb3dfa191557b3d9508b0fb

roles/build-releasenotes/tasks/main.yaml

@@ -4,7 +4,6 @@
     path: "{{ zuul_work_dir }}/releasenotes/source/locale"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: translations
 
 - name: Prepare release note translations

roles/ensure-babel/tasks/main.yaml

@@ -9,7 +9,6 @@
     path: "{{ constraints_file }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: stat_results
   when: constraints_file is defined
 

roles/ensure-if-python/tasks/main.yaml

@@ -21,7 +21,6 @@
   stat:
     get_checksum: false
     get_mime: false
-    get_md5: false
     path: "{{ zuul_work_dir }}/requirements.txt"
   register: requirements_file
 

roles/ensure-javascript-build-tool/tasks/main.yaml

@@ -4,7 +4,6 @@
     path: "{{ zuul_work_dir }}/yarn.lock"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: yarn_lock_exists
 
 - name: Set js_build_tool fact

roles/ensure-javascript-packages/tasks/main.yaml

@@ -3,7 +3,6 @@
     path: "{{ tox_constraints_file }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: stat_results
   when: tox_constraints_file is defined
 
@@ -26,7 +25,6 @@
     path: "{{ zuul_work_dir }}/yarn.lock"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: yarn_lock_exists
 
 - name: Set js_build_tool fact

roles/fetch-javascript-output/tasks/main.yaml

@@ -22,7 +22,6 @@
     path: "{{ zuul_work_dir }}/yarn.lock"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: yarn_lock
 
 - name: Check for shrinkwrap
@@ -30,7 +29,6 @@
     path: "{{ zuul_work_dir }}/npm-shrinkwrap.json"
     get_checksum: false
     get_mime: false
-    get_md5: false
   when: not yarn_lock.stat.exists
   register: shrinkwrap
 
@@ -59,7 +57,6 @@
     path: "{{ zuul_work_dir }}/reports"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: reports_stat
 
 - name: Collect npm reports
@@ -77,7 +74,6 @@
     path: "{{ zuul_work_dir }}/karma.subunit"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: karma_stat
 
 - name: Collect karma subunit files
@@ -96,7 +92,6 @@
     path: "{{ zuul_work_dir }}/npm-shrinkwrap.json"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: shrinkwrap_final
 
 - name: Collect shrinkwrap file
@@ -116,7 +111,6 @@
     path: "{{ zuul_work_dir }}/{{ javascript_content_dir }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: javascript_output
 
 - name: Collect javascript output

roles/fetch-sphinx-tarball/tasks/pdf.yaml

@@ -7,7 +7,6 @@
     path: "{{ zuul_work_dir }}/{{ sphinx_build_dir }}/pdf/{{ zj_sphinx_pdf }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   with_items: "{{ sphinx_pdf_files }}"
   loop_control:
     loop_var: zj_sphinx_pdf

roles/find-constraints/tasks/main.yaml

@@ -3,7 +3,6 @@
     path: "{{ constraints_file | default('missing') }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: stat_results
   when: constraints_file is defined
 

roles/js-package-manager/tasks/main.yaml

@@ -20,7 +20,6 @@
     path: "{{ zuul_work_dir }}/yarn.lock"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: yarn_lock_exists
 
 - name: Set js_build_tool fact

roles/nox/tasks/main.yaml

@@ -3,7 +3,6 @@
     path: "{{ nox_constraints_file }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: stat_results
   when: nox_constraints_file is defined
 

roles/sphinx/tasks/main.yaml

@@ -68,7 +68,6 @@
     path: "{{ zuul_work_virtualenv }}/bin/whereto"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: whereto
 
 - name: Check for htaccess
@@ -76,7 +75,6 @@
     path: "{{ zuul_work_dir }}/{{ sphinx_source_dir }}/_extra/.htaccess"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: htaccess
 
 - name: Run whereto

roles/tox/tasks/main.yaml

@@ -3,7 +3,6 @@
     path: "{{ tox_constraints_file }}"
     get_checksum: false
     get_mime: false
-    get_md5: false
   register: stat_results
   when: tox_constraints_file is defined
 

test-requirements.txt

@@ -7,7 +7,12 @@
 # by 4 weeks to give people time to update before any roles start
 # depending on new features.
 
-ansible>=8,<9
+# Some older versions of Ansible don't support older versions of
+# python we have on older test nodes, so do the best we can in those
+# cases.
+
+ansible>=6,<9;python_version<'3.9'
+ansible>=8,<9;python_version>='3.9'
 stestr>=1.0.0,<3.0.0;python_version<'3.5' # Apache-2.0
 stestr>=1.0.0;python_version>='3.5' # Apache-2.0