Fix CI issues

Fixes following:-
- download the different version pip file
- add project dir to git safe to allow installation
  with pip, more details in [1]

[1] https://bugs.launchpad.net/devstack/+bug/1968798

Change-Id: Iedcf4207b51424c11625e34f146ebd67df2dc4c5

tests/ci/playbooks/rally-install-pre.yaml

@@ -54,9 +54,18 @@
     - name: Install pip3 if needed
       when: os_distro == "CentOS 7" or os_distro == "Ubuntu 18.04" or os_distro == "Ubuntu 20.04"
       shell:
+        executable: /bin/bash
         chdir: '{{ zuul.project.src_dir }}'
         cmd: |
-          curl https://bootstrap.pypa.io/get-pip.py -o /tmp/get-pip.py
+          python_version=`python3 --version`
+          python_version=`echo $python_version |awk '{print $2}'`
+          echo $python_version
+          if [[ $python_version =~ ^3.6 ]]; then
+              pip_url=https://bootstrap.pypa.io/pip/3.6/get-pip.py
+          else
+              pip_url=https://bootstrap.pypa.io/get-pip.py
+          fi
+          curl $pip_url -o /tmp/get-pip.py
           sudo python3 /tmp/get-pip.py
 
     - name: Update pip3 if needed

tests/ci/playbooks/rally-install-run.yaml

@@ -13,6 +13,11 @@
       become: yes
       when: bindep_output.stdout_lines
 
+    # Required for https://bugs.launchpad.net/devstack/+bug/1968798
+    - name: Configure project src_dir as git safe
+      become: yes
+      command: git config --system --add safe.directory {{ ansible_user_dir }}/{{ zuul.project.src_dir }}
+
     - name: Install Rally system wide
       shell:
         executable: /bin/sh

tests/ci/playbooks/tox-install.yaml

@@ -50,7 +50,13 @@
         executable: /bin/bash
         cmd: |
           set -e
-          curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
+          pip_url="https://bootstrap.pypa.io/get-pip.py"
+          if [ "{{ python_version.stdout }}" = "3.6" ];  then
+              pip_url="https://bootstrap.pypa.io/pip/3.6/get-pip.py"
+          elif [ "{{ python_version.stdout }}" = "3" ];  then
+              pip_url="https://bootstrap.pypa.io/pip/3.6/get-pip.py"
+          fi
+          curl $pip_url -o get-pip.py
           python{{ python_version.stdout }} get-pip.py --force-reinstall
 
     - name: Install python tox