Support imagePrefix and versions

Allow the user to specify an image prefix and a version tag.

This updates the functional test to account for a recent change
in Zuul which returns incomplete builds on the API endpoint.

Change-Id: I49e82c790a518c1c9f5a463250b5b785eacde55a

playbooks/zuul-operator-functional/test.yaml

@@ -122,7 +122,7 @@
     - name: get buillds results
       include_tasks: tasks/zuul_web_check.yaml
       vars:
-        endpoint: "/api/tenant/local/builds"
+        endpoint: "/api/tenant/local/builds?complete=true"
 
     - name: ensure success build
       assert:

zuul_operator/templates/nodepool-launcher.yaml

@@ -27,7 +27,7 @@ spec:
     spec:
       containers:
       - name: launcher
-        image: zuul/nodepool-launcher:latest
+        image: {{ spec.imagePrefix }}/nodepool-launcher:{{ spec.nodepoolImageVersion }}
         env:
         - name: KUBECONFIG
           value: /etc/kubernetes/kube.config

zuul_operator/templates/zuul.yaml

@@ -120,7 +120,7 @@ spec:
     spec:
       containers:
       - name: scheduler
-        image: zuul/zuul-scheduler:{{ zuul_version }}
+        image: {{ spec.imagePrefix }}/zuul-scheduler:{{ spec.zuulImageVersion }}
         command: ["/usr/local/bin/zuul-scheduler", "-f", "-d"]
         ports:
         - name: gearman
@@ -200,7 +200,7 @@ spec:
     spec:
       containers:
       - name: web
-        image: zuul/zuul-web:{{ zuul_version }}
+        image: {{ spec.imagePrefix }}/zuul-web:{{ spec.zuulImageVersion }}
         ports:
         - name: zuul-web
           containerPort: 9000
@@ -252,7 +252,7 @@ spec:
         runAsGroup: 10001
       containers:
       - name: executor
-        image: zuul/zuul-executor:{{ zuul_version }}
+        image: {{ spec.imagePrefix }}/zuul-executor:{{ spec.zuulImageVersion }}
         command: ["/usr/local/bin/zuul-executor", "-f", "-d"]
         ports:
         - name: logs
@@ -335,7 +335,7 @@ spec:
         runAsGroup: 10001
       containers:
       - name: merger
-        image: zuul/zuul-merger:{{ zuul_version }}
+        image: {{ spec.imagePrefix }}/zuul-merger:{{ spec.zuulImageVersion }}
         volumeMounts:
         - name: zuul-config
           mountPath: /etc/zuul

zuul_operator/zuul.py

@@ -71,6 +71,10 @@ class Zuul:
         self.spec.setdefault('merger', {}).setdefault('count', 0)
         self.spec.setdefault('web', {}).setdefault('count', 1)
 
+        self.spec.setdefault('imagePrefix', 'docker.io/zuul')
+        self.spec.setdefault('zuulImageVersion', 'latest')
+        self.spec.setdefault('nodepoolImageVersion', 'latest')
+
         self.cert_manager = certmanager.CertManager(
             self.api, self.namespace, self.log)
         self.installing_cert_manager = False
@@ -266,11 +270,11 @@ class Zuul:
         for provider_name, secret_name in\
             self.nodepool_provider_secrets.items():
             kw = {
-                'zuul_version': '4.1.0',
                 'instance_name': self.name,
                 'provider_name': provider_name,
                 'nodepool_config_secret_name': secret_name,
                 'external_config': self.spec.get('externalConfig', {}),
+                'spec': self.spec,
             }
         utils.apply_file(self.api, 'nodepool-launcher.yaml',
                          namespace=self.namespace, **kw)
@@ -310,7 +314,6 @@ class Zuul:
     def create_zuul(self):
         kw = {
             'zuul_conf_sha': self.zuul_conf_sha,
-            'zuul_version': '4.1.0',
             'zuul_tenant_secret': self.tenant_secret,
             'instance_name': self.name,
             'connections': self.spec['connections'],