Adding in a new location for the default popen executor.

buildman/manager/executor.py

@@ -271,7 +271,9 @@ class PopenExecutor(BuilderExecutor):
     }
 
     logpipe = LogPipe(logging.INFO)
-    spawned = subprocess.Popen('/Users/jake/bin/quay-builder', stdout=logpipe, stderr=logpipe,
+    spawned = subprocess.Popen(os.environ.get("BUILDER_BINARY_LOCATION",'/usr/local/quay-builer'),
+                               stdout=logpipe,
+                               stderr=logpipe,
                                env=builder_env)
 
     builder_id = str(uuid.uuid4())