Fix bad commit from #8095 and fix bad splitting on :'s in the image

Fixes #8095
Fixes #8658

cloud/docker

@@ -197,6 +197,14 @@ options:
     default: false
     aliases: []
     version_added: "1.8"
+  registry:
+    description:
+      - The remote registry URL to use for pulling images.
+    required: false
+    default: ''
+    aliases: []
+    version_added: "1.8"
+
 author: Cove Schneider, Joshua Conner, Pavel Antonov
 requirements: [ "docker-py >= 0.3.0", "docker >= 0.10.0" ]
 '''
@@ -499,13 +507,6 @@ class DockerManager:
     def get_split_image_tag(self, image):
         if '/' in image:
             image = image.split('/')[-1]
-        tag = None
-        if image.find(':') > 0:
-            return image.split(':')
-        else:
-            return image, tag
-
-    def get_split_full_image_tag(self, image):
         tag = "latest"
         if image.find(':') > 0:
             return image.split(':')
@@ -611,8 +612,13 @@ class DockerManager:
         try:
             containers = do_create(count, params)
         except:
-            image, tag = self.get_split_full_image_tag(params['image'])
-            self.client.pull(image, tag = tag)
+            image, tag = self.get_split_image_tag(params['image'])
+            if self.module.params.get('username'):
+                self.client.login(self.module.params.get('username'),
+                                  password=self.module.params.get('password'),
+                                  email=self.module.params.get('email'),
+                                  registry=self.module.params.get('registry'))
+            self.client.pull(image, tag=tag)
             self.increment_counter('pull')
             containers = do_create(count, params)
 
@@ -700,9 +706,10 @@ def main():
             memory_swap     = dict(default=0),
             docker_url      = dict(default='unix://var/run/docker.sock'),
             docker_api_version = dict(default=docker.client.DEFAULT_DOCKER_API_VERSION),
-            user            = dict(default=None),
+            username        = dict(default=None),
             password        = dict(),
             email           = dict(),
+            registry        = dict(),
             hostname        = dict(default=None),
             env             = dict(type='dict'),
             dns             = dict(),