feat: add pre-defined secrets to csi-driver-smb addon (#1215)

* added ability to use pre-defined secrets

* renamed variables to existing_secret_name and existing_secret_namespace

.github/tests/addons.yaml

@@ -26,7 +26,7 @@ csi_driver_nfs:
 csi_driver_smb:
   enabled: true
   storage_class:
-    - name: fake
+    - name: fake1
       source: //localhost/fake
       username: fake
       password: fake
@@ -34,6 +34,32 @@ csi_driver_smb:
       dir_mode: 0644
       uid: 100
       gid: 100
+    - name: fake2
+      source: //localhost/fake
+      file_mode: 0755
+      dir_mode: 0644
+      uid: 100
+      gid: 100
+      existing_secret_name: fake
+      existing_secret_namespace: fake
+    - name: fake3
+      source: //localhost/fake
+      username: fake
+      password: fake
+      file_mode: 0755
+      dir_mode: 0644
+      uid: 100
+      gid: 100
+      existing_secret_name: fake
+    - name: fake4
+      source: //localhost/fake
+      username: fake
+      password: fake
+      file_mode: 0755
+      dir_mode: 0644
+      uid: 100
+      gid: 100
+      existing_secret_namespace: fake
 
 system_upgrade_controller:
   enabled: true