Drop Ansible support for v2.9 and v2.10 (#8925)

Ansible v2.9 and v2.10 are EOL as [1].
This drops those version supports by following the upstream Ansible.

This sets use_ssh_args true always because that is required to use
ssh_args on ansible.cfg on Ansible v2.11 or later[2].

ansible_ssh_host is replaced with ansible_host because ansible_ssh_host
has been deprecated already and cenots7 jobs were failed due to the
deprecated ansible_ssh_host.

[1]: https://docs.ansible.com/ansible/devel/reference_appendices/release_and_maintenance.html#ansible-core-changelogs
[2]: https://docs.ansible.com/ansible/latest/collections/ansible/posix/synchronize_module.html#parameter-use_ssh_args

tests/cloud_playbooks/roles/packet-ci/templates/inventory.j2

@@ -1,6 +1,6 @@
 [all]
 {% for instance in vms.results %}
-instance-{{ loop.index }} ansible_ssh_host={{instance.stdout}}
+instance-{{ loop.index }} ansible_host={{instance.stdout}}
 {% endfor %}
 
 {% if mode is defined and mode in ["separate", "separate-scale"] %}

tests/cloud_playbooks/wait-for-ssh.yml

@@ -6,7 +6,7 @@
   tasks:
   - name: Wait until SSH is available
     wait_for:
-      host: "{{ ansible_ssh_host }}"
+      host: "{{ ansible_host }}"
       port: 22
       timeout: 240
     delegate_to: localhost

tests/requirements-2.10.txt

@@ -1,11 +0,0 @@
--r ../requirements-2.10.txt
-yamllint==1.19.0
-apache-libcloud==2.2.1
-tox==3.11.1
-dopy==0.3.7
-ansible-lint==5.4.0
-molecule==3.0.6
-molecule-vagrant==0.3
-testinfra==5.2.2
-python-vagrant==0.5.15
-ara[server]==1.5.7

tests/requirements-2.9.txt

@@ -1,14 +0,0 @@
--r ../requirements-2.9.txt
-yamllint==1.19.0
-apache-libcloud==2.2.1
-tox==3.11.1
-dopy==0.3.7
-ansible-lint==5.4.0 ; python_version >= '3.0'
-ansible-lint==4.2.0 ; python_version < '3.0'
-molecule==3.0.6 ; python_version >= '3.0'
-molecule==3.0.2 ; python_version < '3.0'
-molecule-vagrant==0.3
-testinfra==5.2.2 ; python_version >= '3.0'
-testinfra==3.4.0 ; python_version < '3.0'
-python-vagrant==0.5.15
-ara[server]==1.5.7