Add an API to determine the maven coordinates for an external artifact

Change-Id: Ief747497e2d02353aeb8515597f722aaf23cdf2e
diff --git a/tools/build/bazel/BUILD b/tools/build/bazel/BUILD
index e513517..6c4e6ec 100644
--- a/tools/build/bazel/BUILD
+++ b/tools/build/bazel/BUILD
@@ -1,27 +1,27 @@
 py_binary(
     name = "onos_app_writer",
-    srcs = [ "onos_app.py" ],
+    srcs = ["onos_app.py"],
     main = "onos_app.py",
     visibility = ["//visibility:public"],
 )
 
 py_binary(
     name = "onos-app-oar",
-    srcs = [ "onos_oar.py" ],
+    srcs = ["onos_oar.py"],
     main = "onos_oar.py",
     visibility = ["//visibility:public"],
 )
 
 py_binary(
-  name = "onos-stage",
-  srcs = [ "onos_stage.py" ],
-  main = "onos_stage.py",
-  visibility = ["//visibility:public"],
+    name = "onos-stage",
+    srcs = ["onos_stage.py"],
+    main = "onos_stage.py",
+    visibility = ["//visibility:public"],
 )
 
 py_binary(
-  name = 'onos-feature',
-  srcs = [ "onos_feature.py" ],
-  main = 'onos_feature.py',
-  visibility = ["//visibility:public"],
+    name = "onos-feature",
+    srcs = ["onos_feature.py"],
+    main = "onos_feature.py",
+    visibility = ["//visibility:public"],
 )