Teach build-local-images to build service-catalog

Building images from RPM takes quite a bit of time, so add service catalog to
the local image build list. A prerequisite for this task is to have the service
catalog binaries compiled, which is done with openshift#1:

1) cmd/service-catalog/go/src/github.com/kubernetes-incubator/service-catalog/hack/build-go.sh
2) hack/build-local-images service-catalog

The first script uses the origin tooling to build in the same way as the RPMs
are built. Note that a new "enable_default" key has been added to the
image_config and set to False for service catalog so that it is not built unless
directly specified (as indicated in openshift#2).

Author: Jeff Peeler

hack/build-local-images.py

@@ -127,7 +127,18 @@
             "openshift": "/usr/bin/openshift"
         },
         "files": {}
-    }
+    },
+    "service-catalog": {
+        "directory": "service-catalog",
+        "vendor_dir": "cmd/service-catalog/go/src/\
+github.com/kubernetes-incubator/service-catalog",
+        "binaries": {
+            "controller-manager": "/usr/bin/controller-manager",
+            "apiserver": "/usr/bin/apiserver",
+        },
+        "files": {},
+        "enable_default": False,
+    },
 }
 
 
@@ -138,13 +149,11 @@ def image_rebuild_requested(image):
     suffix explicitly or does not provide
     any explicit requests.
     """
-    return len(sys.argv) == 1 or (
-        len(sys.argv) > 1 and (
-            image in sys.argv or
-            full_name(image) in sys.argv
-        )
-    )
-
+    build_image = image_config[image].get("enable_default", True)
+    if len(sys.argv) == 1:
+        return build_image
+    if image in sys.argv or full_name(image) in sys.argv:
+        return True
 
 def full_name(image):
     """
@@ -185,7 +194,8 @@ def debug(message):
 
 
 os_root = abspath(join(dirname(__file__), ".."))
-os_bin_path = join(os_root, "_output", "local", "bin", "linux", "amd64")
+binary_dir_args = ["_output", "local", "bin", "linux", "amd64"]
+os_bin_path = join(os_root, *binary_dir_args)
 os_image_path = join(os_root, "images")
 
 context_dir = mkdtemp()
@@ -207,6 +217,8 @@ def debug(message):
 
     config = image_config[image]
     for binary in config.get("binaries", []):
+        if "vendor_dir" in config:
+            os_bin_path = join(os_root, config.get("vendor_dir"), *binary_dir_args)
         add_to_context(
             context_dir,
             source=join(os_bin_path, binary),