Enabling multi-tenancy for fission objects. (#655)

This feature allows creation of fission objects in different namespaces, in addition to retaining the existing behavior of creating fission objects in default namespace if user doesnt provide one. 
It also removes cluster admin roles for fission-fetcher and fission-builder Service Accounts and grants them only those privileges that they need.

buildermgr/common.go

@@ -22,8 +22,6 @@ import (
 	"net/http"
 	"strings"
 
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-
 	"github.com/dchest/uniuri"
 	"github.com/fission/fission"
 	"github.com/fission/fission/builder"
@@ -40,17 +38,17 @@ import (
 // 3. Send upload request to fetcher to upload deployment package.
 // 4. Return upload response and build logs.
 // *. Return build logs and error if any one of steps above failed.
-func buildPackage(fissionClient *crd.FissionClient, builderNamespace string,
+func buildPackage(fissionClient *crd.FissionClient, envBuilderNamespace string,
 	storageSvcUrl string, pkg *crd.Package) (uploadResp *fetcher.UploadResponse, buildLogs string, err error) {
 
-	env, err := fissionClient.Environments(metav1.NamespaceDefault).Get(pkg.Spec.Environment.Name)
+	env, err := fissionClient.Environments(pkg.Spec.Environment.Namespace).Get(pkg.Spec.Environment.Name)
 	if err != nil {
 		e := fmt.Sprintf("Error getting environment CRD info: %v", err)
 		log.Println(e)
 		return nil, e, fission.MakeError(http.StatusInternalServerError, e)
 	}
 
-	svcName := fmt.Sprintf("%v-%v.%v", env.Metadata.Name, env.Metadata.ResourceVersion, builderNamespace)
+	svcName := fmt.Sprintf("%v-%v.%v", env.Metadata.Name, env.Metadata.ResourceVersion, envBuilderNamespace)
 	srcPkgFilename := fmt.Sprintf("%v-%v", pkg.Metadata.Name, strings.ToLower(uniuri.NewLen(6)))
 	fetcherC := fetcherClient.MakeClient(fmt.Sprintf("http://%v:8000", svcName))
 	builderC := builderClient.MakeClient(fmt.Sprintf("http://%v:8001", svcName))
@@ -131,7 +129,7 @@ func updatePackage(fissionClient *crd.FissionClient,
 	}
 
 	// update package spec
-	pkg, err := fissionClient.Packages(metav1.NamespaceDefault).Update(pkg)
+	pkg, err := fissionClient.Packages(pkg.Metadata.Namespace).Update(pkg)
 	if err != nil {
 		log.Printf("Error updating package: %v", err)
 		return nil, err