Subcloud remote install with patched iso (r8, ds8)

Added notes about the need of iso imported via load-import --active to
be at the same patch level as the system controller for the prestaged
and non-prestaged subcloud remote installation.

Change-Id: I778977df3779bbb08aebe59713fe4681bf91f163
Signed-off-by: Ngairangbam Mili <ngairangbam.mili@windriver.com>
(cherry picked from commit 8a0e02cd07)

doc/source/dist_cloud/kubernetes/installing-a-subcloud-using-redfish-platform-management-service.rst

@@ -58,17 +58,28 @@ subcloud, the subcloud installation has these phases:
 
     .. note::
 
-        This is required only once and does not have to be done for every
+        - This is required only once and does not have to be done for every
-        subcloud install.
+          subcloud install.
 
-        :command:`dcmanager` recognizes bootimage names ending in <.iso> and
+          :command:`dcmanager` recognizes bootimage names ending in ``.iso`` and
-        <.sig>
+          ``.sig``.
 
-        For example,
+          For example,
 
-        .. parsed-literal::
+          .. parsed-literal::
 
-            ~(keystone_admin)]$ system --os-region-name SystemController load-import --active |installer-image-name|.iso |installer-image-name|.sig
+              ~(keystone_admin)]$ system --os-region-name SystemController load-import --active |installer-image-name|.iso |installer-image-name|.sig
+
+        - The ISO imported via ``load-import --active`` must be at the same
+          patch level as the system controller. This ensures that the subcloud
+          boot image aligns with the patch level of the load to be installed on
+          the subcloud.
+        
+    .. warning::
+        
+        If the patch level of load-imported ISO does not match the system controller
+        patch level, the subcloud patch state may not align with the system
+        controller patch state.
 
 -   Run the :command:`load-import` command on controller-0 to import
     the new release.

doc/source/dist_cloud/kubernetes/prestage-a-subcloud-using-dcmanager-df756866163f.rst

@@ -75,6 +75,15 @@ There are two types of subcloud prestage:
    image pulls and archive file generation. If the total size of prestage
    images is N GB, available Docker space should be N*2 GB.
 
+.. note::
+
+    For the prestaged remote subcloud installations, the ISO imported via
+    ``load-import --inactive`` must be at the same patch level as the system
+    controller. If the system controller is patched after prestaging of
+    subclouds, you need to repeat the prestaging of each subcloud. This
+    ensures that the subcloud boot image aligns with the patch level of the
+    load that needs to be installed on the subcloud.
+
 .. warning::
 
     If the available docker space is inadequate, some application pods can get