Remove job registration check

This is not applicable in v3.

Change-Id: I770fc7b0897a34715037862e44d6a2f8c3823570
diff --git a/doc/source/zuul.rst b/doc/source/zuul.rst
index 2285ecb..102beac 100644
--- a/doc/source/zuul.rst
+++ b/doc/source/zuul.rst
@@ -52,11 +52,6 @@
   Port on which the Gearman server is listening.
   ``port=4730`` (optional)
 
-**check_job_registration**
-  Check to see if job is registered with Gearman or not. When True
-  a build result of NOT_REGISTERED will be return if job is not found.
-  ``check_job_registration=True``
-
 gearman_server
 """"""""""""""
 
diff --git a/zuul/launcher/client.py b/zuul/launcher/client.py
index c2dd1d5..14773cb 100644
--- a/zuul/launcher/client.py
+++ b/zuul/launcher/client.py
@@ -194,11 +194,6 @@
             port = config.get('gearman', 'port')
         else:
             port = 4730
-        if config.has_option('gearman', 'check_job_registration'):
-            self.job_registration = config.getboolean(
-                'gearman', 'check_job_registration')
-        else:
-            self.job_registration = True
 
         self.gearman = ZuulGearmanClient(self)
         self.gearman.addServer(server, port)
@@ -397,13 +392,6 @@
         build.__gearman_job = gearman_job
         self.builds[uuid] = build
 
-        if self.job_registration and not self.isJobRegistered(
-                gearman_job.name):
-            self.log.error("Job %s is not registered with Gearman" %
-                           gearman_job)
-            self.onBuildCompleted(gearman_job, 'NOT_REGISTERED')
-            return build
-
         if pipeline.precedence == zuul.model.PRECEDENCE_NORMAL:
             precedence = gear.PRECEDENCE_NORMAL
         elif pipeline.precedence == zuul.model.PRECEDENCE_HIGH: