Add ubuntu-focal install job

Change-Id: Ic5e4f41f142d978d5e85b27ea324805bef307983

.zuul.d/install-jobs.yaml

@@ -0,0 +1,27 @@
+- job:
+    name: rally-install-base
+    parent: base
+    pre-run: tests/ci/playbooks/rally-install-pre.yaml
+    run: tests/ci/playbooks/rally-install-run.yaml
+    post-run: tests/ci/playbooks/fetch-html-and-json-reports.yaml
+    timeout: 1800
+
+- job:
+    name: rally-install-ubuntu-bionic
+    parent: rally-install-base
+    nodeset: ubuntu-bionic
+
+- job:
+    name: rally-install-ubuntu-focal
+    parent: rally-install-base
+    nodeset: ubuntu-focal
+
+- job:
+    name: rally-install-centos-7
+    parent: rally-install-base
+    nodeset: centos-7
+
+- job:
+    name: rally-install-centos-8
+    parent: rally-install-base
+    nodeset: centos-8

.zuul.d/zuul.yaml

@@ -1,25 +1,3 @@
-- job:
-    name: rally-install-base
-    parent: base
-    pre-run: tests/ci/playbooks/rally-install-pre.yaml
-    run: tests/ci/playbooks/rally-install-run.yaml
-    post-run: tests/ci/playbooks/fetch-html-and-json-reports.yaml
-    timeout: 1800
-
-- job:
-    name: rally-install-ubuntu-bionic
-    parent: rally-install-base
-    nodeset: ubuntu-bionic
-
-- job:
-    name: rally-install-centos-7
-    parent: rally-install-base
-    nodeset: centos-7
-
-- job:
-    name: rally-install-centos-8
-    parent: rally-install-base
-    nodeset: centos-8
 
 - project:
     templates:
@@ -39,6 +17,7 @@
         - rally-tox-functional-py38
         - rally-tox-self
         - rally-install-ubuntu-bionic
+        - rally-install-ubuntu-focal
         - rally-install-centos-7
         - rally-install-centos-8
         - rally-docker-build
@@ -53,6 +32,7 @@
         - rally-tox-functional
         - rally-tox-self
         - rally-install-ubuntu-bionic
+        - rally-install-ubuntu-focal
         - rally-install-centos-7
         - rally-install-centos-8
     post:

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

@@ -1,29 +1,12 @@
 - hosts: all
   name: Prepare host to install Rally
   tasks:
-    - name: Check whether apt is available
-      shell:
-        cmd: "apt-get --version"
-        executable: /bin/sh
-      register: apt_get_installed
-      ignore_errors: True
-
-    - name: Check whether dnf is available
-      shell:
-        cmd: "dnf --version"
-        executable: /bin/sh
-      register: dnf_installed
-      ignore_errors: True
-
-    - name: Check whether yum is available
-      shell:
-        cmd: "yum --version"
-        executable: /bin/sh
-      register: yum_installed
-      ignore_errors: True
+    - name: Set Apache URL
+      set_fact:
+        os_distro: '{{ ansible_distribution }} {{ ansible_distribution_version }}'
 
     - name: Install required packages (Centos-7)
-      when: yum_installed.rc == 0
+      when: os_distro == "CentOS 7"
       shell:
         cmd: |
           sudo yum remove -y python-crypto || true
@@ -35,18 +18,33 @@
           sudo yum install -y https://centos7.iuscommunity.org/ius-release.rpm
           sudo yum install -y python36u python36u-devel
 
-          curl https://bootstrap.pypa.io/get-pip.py -o /tmp/get-pip.py
-          sudo python3 /tmp/get-pip.py
-
-    - name: Install required packages (Ubuntu)
-      when: apt_get_installed.rc == 0
+    - name: Install required packages (Ubuntu-Bionic)
+      when: os_distro == "Ubuntu 18.04"
       shell:
         chdir: '{{ zuul.project.src_dir }}'
         cmd: |
           # NOTE(pabelanger): We run apt-get update to ensure we dont have a stale
           # package cache in the gate.
-          sudo apt-get update
-          sudo apt-get install --yes python3.6-dev
+          sudo apt update
+          sudo apt install --yes python3.6-dev
+
+    - name: Install required packages (Ubuntu-Focal)
+      when: os_distro == "Ubuntu 20.04"
+      shell:
+        chdir: '{{ zuul.project.src_dir }}'
+        cmd: |
+          # NOTE(pabelanger): We run apt-get update to ensure we dont have a stale
+          # package cache in the gate.
+          sudo apt update
+          sudo apt install --yes python3.8-dev
+
+    - name: Install pip3 if needed
+      when: os_distro == "CentOS 7" or os_distro == "Ubuntu 18.04" or os_distro == "Ubuntu 20.04"
+      shell:
+        chdir: '{{ zuul.project.src_dir }}'
+        cmd: |
+          curl https://bootstrap.pypa.io/get-pip.py -o /tmp/get-pip.py
+          sudo python3 /tmp/get-pip.py
 
     - name: Install bindep
       shell: