Builder manager bugfixes (#367)

This contains a few different builder manager fixes:

* Update the zip file structure to avoid an extra subdirectory
* Annotate packages with what functions are using them
* Only trigger builds when there is no deployment archive
* Python environment loadpath bugfixes
* Other bugfixes

controller/api.go

@@ -181,7 +181,6 @@ func (api *API) Serve(port int) {
 	r.HandleFunc("/proxy/{dbType}", api.FunctionLogsApiPost).Methods("POST")
 	r.HandleFunc("/proxy/storage/v1/archive", api.StorageServiceProxy)
 	r.HandleFunc("/proxy/buildermgr/v1/build", api.BuilderManagerBuildProxy)
-	r.HandleFunc("/proxy/buildermgr/v1/builder", api.BuilderManagerEnvBuilderProxy)
 	r.HandleFunc("/proxy/logs/{function}", api.FunctionPodLogs).Methods("POST")
 	r.HandleFunc("/proxy/workflows-apiserver/{path:.*}", api.WorkflowApiserverProxy)
 

controller/buildermgr.go

@@ -26,7 +26,7 @@ import (
 
 func (api *API) BuilderManagerBuildProxy(w http.ResponseWriter, r *http.Request) {
 	u := api.builderManagerUrl + "/v1/build"
-	proxy, err := api._getBuilderManagerProxy(u)
+	proxy, err := api.getBuilderManagerProxy(u)
 	if err != nil {
 		msg := fmt.Sprintf("Failed to establish proxy server: %v", err)
 		log.Println(msg)
@@ -36,19 +36,7 @@ func (api *API) BuilderManagerBuildProxy(w http.ResponseWriter, r *http.Request)
 	proxy.ServeHTTP(w, r)
 }
 
-func (api *API) BuilderManagerEnvBuilderProxy(w http.ResponseWriter, r *http.Request) {
-	u := api.builderManagerUrl + "/v1/builder"
-	proxy, err := api._getBuilderManagerProxy(u)
-	if err != nil {
-		msg := fmt.Sprintf("Failed to establish proxy server: %v", err)
-		log.Println(msg)
-		http.Error(w, msg, 500)
-		return
-	}
-	proxy.ServeHTTP(w, r)
-}
-
-func (api *API) _getBuilderManagerProxy(targetUrl string) (*httputil.ReverseProxy, error) {
+func (api *API) getBuilderManagerProxy(targetUrl string) (*httputil.ReverseProxy, error) {
 	svcUrl, err := url.Parse(targetUrl)
 	if err != nil {
 		return nil, err