rbd: move radosNamespace to RBD section

As radosNamespace is more specific to
RBD not the general ceph configuration. Now
we introduced a new RBD section for RBD specific
options, Moving the radosNamespace to RBD section
and keeping the radosNamespace still under the
global ceph level configration for backward
compatibility.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
(cherry picked from commit b4acbd08a5)

e2e/configmap.go

@@ -60,9 +60,14 @@ func createConfigMap(pluginPath string, c kubernetes.Interface, f *framework.Fra
 		return err
 	}
 	conmap := []util.ClusterInfo{{
-		ClusterID:      fsID,
-		Monitors:       mons,
-		RadosNamespace: radosNamespace,
+		ClusterID: fsID,
+		Monitors:  mons,
+		RBD: struct {
+			NetNamespaceFilePath string `json:"netNamespaceFilePath"`
+			RadosNamespace       string `json:"radosNamespace"`
+		}{
+			RadosNamespace: radosNamespace,
+		},
 	}}
 	if upgradeTesting {
 		subvolumegroup = "csi"
@@ -132,7 +137,7 @@ func createCustomConfigMap(
 			case "radosNamespace":
 				for c := range conmap {
 					if conmap[c].ClusterID == cluster {
-						conmap[c].RadosNamespace = j
+						conmap[c].RBD.RadosNamespace = j
 					}
 				}
 			}