Re-add missed paste module

This PS adds Paste module that was lost during py38/focal upgrade. Also airskiff gate has been altered to use focal image of armada as bionic to cover ubuntu releases change. Airskiff in treasuremap is still pointed to bionic while here we want to test focal in airskiff.

Change-Id: I3cb1eb6232a332707a1440d33d8908ae83603487

requirements-direct.txt

@@ -18,6 +18,8 @@ oslo.policy<=3.10.1
 oslo.middleware<=4.4.0
 keystonemiddleware<=10.2.0
 oslo.utils<=4.12.3
+Paste>=2.0.3
+PasteDeploy>=1.5.2
 prometheus-client==0.8.0
 pylibyaml==0.1.0
 python-dateutil==2.8.1

requirements-frozen.txt

@@ -44,6 +44,8 @@ oslo.policy==3.10.1
 oslo.serialization==5.1.1
 oslo.utils==4.12.3
 packaging==23.1
+Paste==3.5.3
+PasteDeploy==3.0.1
 pbr==5.11.1
 pip==23.0.1
 prometheus-client==0.8.0

tools/gate/playbooks/airskiff-deploy.yaml

@@ -55,6 +55,13 @@
       args:
         chdir: "{{ zuul.projects['opendev.org/airship/treasuremap'].src_dir }}"
 
+    - name: Use Armada focal image as bionic for tests
+      shell: |
+        set -x
+        docker tag  quay.io/airshipit/armada:latest-ubuntu_focal quay.io/airshipit/armada:latest-ubuntu_bionic
+      args:
+        chdir: "{{ zuul.projects['opendev.org/airship/treasuremap'].src_dir }}"
+
     - name: Deploy Airship components using Armada
       shell: |
         mkdir -p ~/.kube