Switching local gating scripts to Python3 to comply with Zuul

The initial version of gating playbook contained ability
to run them either on Python2 or Python3 ansible.
But it causes a lot of issues e.g. a need to install[1] both
versions of libs to support both possible ways to run,
discrepancy between local and Zuul run[2]
Zuul testing is done with ansible running on Python3 [3].
Meanwhile ppa repo for ansible contains ansible pachage
that depends only from python2. There is no package for
Python3 and we used only Python2-ansyble.
The fact that Zuul runs it with different configuration
means that we'll keep facing the issues with dependencies
in future, since Gating doesn't test it.
This patch changes makes local scripts run as Zuul.

PS
The script partially takes care of reverting intallation
from its previous runs. To cleanup completely it's possible
to run [4] in case these pacakges are not used by anyone else

[1]
https://opendev.org/airship/airshipctl/src/branch/master/roles/libvirt-install/tasks/main.yaml#L38
[2]
https://review.opendev.org/#/c/717841/
https://review.opendev.org/#/c/718590/
[3]
https://zuul.opendev.org/t/openstack/build/4096513604a84cd2b2f2578fc3f98660/log/zuul-info/host-info.primary.yaml#498
[4]
if dpkg -l | grep "ansible.*ppa~bionic"; then
      sudo apt -y remove ansible
      sudo apt -y autoremove
      sudo add-apt-repository -r -y ppa:ansible/ansible
      sudo apt-get -y update
fi
+ possibly
sudo apt remove virtinst python-libvirt python-docker python-requests python-lxml python-libvirt

Change-Id: Ia1ac3aa4128f6c4797dea1709ccb8516ae342a66

roles/airshipctl-publish-images/tasks/main.yaml

@@ -10,12 +10,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Install python-docker Module
+- name: Install python3-docker and python3-requests Modules
   apt:
     pkg:
-      - python-docker
       - python3-docker
-      - python-requests
       - python3-requests
     state: present
   when: ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'

roles/libvirt-install/tasks/main.yaml

@@ -22,7 +22,6 @@
         - libvirt-devel
         - libvirt-daemon-kvm
         - qemu-kvm
-        - virt-install
       state: present
   - name: Ensuring Libvirt, Qemu and support packages are present
     become: true
@@ -33,11 +32,8 @@
         - libvirt-bin
         - libguestfs-tools
         - qemu-kvm
-        - virtinst
-        - python-lxml
         - python3-lxml
         - python3-libvirt
-        - python-libvirt
         - dnsmasq
         - ebtables
       state: present

roles/redfish-emulator/tasks/install.yaml

@@ -23,7 +23,6 @@
       name:
         - python3-pip
         - python3-libvirt
-        - python-libvirt
       state: present
 
   - name: Install sushy-tools

roles/reverse-proxy/tasks/dependencies.yaml

@@ -11,7 +11,6 @@
       name:
         - python3-pip
         - python3-libvirt
-        - python-libvirt
       state: present
 
   - name: Install required pip packages

tools/gate/00_setup.sh

@@ -32,10 +32,9 @@ mkdir -p "$TMP_DIR"
 envsubst <"${AIRSHIPCTL_WS}/tools/gate/config_template.yaml" > "$PLAYBOOK_CONFIG"
 
 # use new version of ansible, Ubuntu has old one
-sudo apt install software-properties-common
-sudo apt-add-repository --yes --update ppa:ansible/ansible
-sudo apt-get -y update
-sudo apt-get -y --no-install-recommends install docker.io ansible make python-passlib
+sudo apt install software-properties-common python3-pip
+sudo apt-get -y --no-install-recommends install docker.io make
+sudo pip3 install ansible
 
-echo "primary ansible_host=localhost ansible_connection=local" > "$ANSIBLE_HOSTS"
+echo "primary ansible_host=localhost ansible_connection=local ansible_python_interpreter=/usr/bin/python3" > "$ANSIBLE_HOSTS"
 printf "[defaults]\nroles_path = %s/roles\n" "$AIRSHIPCTL_WS" > "$ANSIBLE_CFG"