Remove ZUUL_PROJECT

Removing old ZUUL_ env variables which have been replaced with
Ansible variables.

Change-Id: I792dae10c0716b4367c41830428e5c87f81e323e
diff --git a/tests/base.py b/tests/base.py
index d15f39c..d255cf7 100755
--- a/tests/base.py
+++ b/tests/base.py
@@ -1123,7 +1123,7 @@
             self.node = self.parameters['nodes'][0]['label']
         self.unique = self.parameters['ZUUL_UUID']
         self.pipeline = self.parameters['zuul']['pipeline']
-        self.project = self.parameters['ZUUL_PROJECT']
+        self.project = self.parameters['zuul']['project']['name']
         self.name = self.parameters['job']
         self.wait_condition = threading.Condition()
         self.waiting = False
@@ -2511,7 +2511,7 @@
         for job in self.history:
             if (job.name == name and
                 (project is None or
-                 job.parameters['ZUUL_PROJECT'] == project)):
+                 job.parameters['zuul']['project']['name'] == project)):
                 return job
         raise Exception("Unable to find job %s in history" % name)
 
diff --git a/zuul/executor/client.py b/zuul/executor/client.py
index 81aae1f..d2690ce 100644
--- a/zuul/executor/client.py
+++ b/zuul/executor/client.py
@@ -192,8 +192,7 @@
             zuul_params['items'].append(d)
 
         # Legacy environment variables
-        params = dict(ZUUL_UUID=uuid,
-                      ZUUL_PROJECT=item.change.project.name)
+        params = dict(ZUUL_UUID=uuid)
 
         params['job'] = job.name
         params['timeout'] = job.timeout