Refactor jobs to support pip / git installation testing

Because we want users to support both pip / git install methods,
refactor testing to support the testing of that.

Change-Id: Ieef3763172fbfe07a5d0cc4c83c37a6dad30b3cd
Depends-On: https://review.openstack.org/560996
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -1,11 +1,22 @@
 - job:
-    name: ansible-role-nodepool
-    run: tests/test.yaml
+    name: ansible-role-nodepool-base
+    run: tests/playbooks/run.yaml
     post-run: tests/collect-logs.yaml
     required-projects:
       - name: openstack-infra/nodepool
     roles:
       - zuul: openstack/ansible-role-nodepool
+    vars:
+      # TODO(pabelanger): This needs to fix to defaut to this when not using
+      # a virtualenv.
+      nodepool_pip_executable: pip3
+
+# Testing for nodepool_install_method: pip
+- job:
+    name: ansible-role-nodepool
+    parent: ansible-role-nodepool-base
+    vars:
+      nodepool_install_method: pip
 
 - job:
     name: ansible-role-nodepool-fedora-27
@@ -22,6 +33,29 @@
     parent: ansible-role-nodepool
     nodeset: ubuntu-xenial
 
+# Testing for nodepool_install_method: git
+- job:
+    name: ansible-role-nodepool-src
+    parent: ansible-role-nodepool-base
+    vars:
+      nodepool_git_update: false
+      nodepool_install_method: git
+
+- job:
+    name: ansible-role-nodepool-src-fedora-27
+    parent: ansible-role-nodepool-src
+    nodeset: fedora-27
+
+- job:
+    name: ansible-role-nodepool-src-ubuntu-bionic
+    parent: ansible-role-nodepool-src
+    nodeset: ubuntu-bionic
+
+- job:
+    name: ansible-role-nodepool-src-ubuntu-xenial
+    parent: ansible-role-nodepool-src
+    nodeset: ubuntu-xenial
+
 - project:
     name: openstack/ansible-role-nodepool
     templates:
@@ -33,9 +67,14 @@
         - ansible-role-nodepool-fedora-27
         - ansible-role-nodepool-ubuntu-bionic
         - ansible-role-nodepool-ubuntu-xenial
+        - ansible-role-nodepool-src-fedora-27
+        - ansible-role-nodepool-src-ubuntu-bionic
+        - ansible-role-nodepool-src-ubuntu-xenial
         - tox-linters
     gate:
       jobs:
         - ansible-role-nodepool-fedora-27
         - ansible-role-nodepool-ubuntu-xenial
+        - ansible-role-nodepool-src-fedora-27
+        - ansible-role-nodepool-src-ubuntu-xenial
         - tox-linters

tests/playbooks/run.yaml

@@ -14,8 +14,6 @@
 ---
 - hosts: all
   vars:
-    nodepool_git_update: false
-    nodepool_pip_executable: pip3
     rolename: ansible-role-nodepool
 
   roles:
@@ -139,12 +137,14 @@
       stat:
         path: /home/zuul/src/git.openstack.org/openstack-infra/nodepool
       register: nodepool_git_dest_stat
+      when: nodepool_install_method == 'git'
 
     - name: Assert nodepool_git_dest tests.
       assert:
         that:
           - nodepool_git_dest_stat.stat.exists
           - nodepool_git_dest_stat.stat.isdir
+      when: nodepool_install_method == 'git'
 
     - name: Register /etc/systemd/system/nodepool-builder.service
       stat: