Added scenarios handled in UI in case of failures

tendrl-bug-id: Tendrl#252
Signed-off-by: Shubhendu <shtripat@redhat.com>

specs/unmanage_cluster.adoc

@@ -257,6 +257,20 @@ If task failed due to some issues, the cluster details would listed as below in
 
 *** Kebab menu for the un-managed cluster would be hidden
 
+* If a previous import failed or cluster is in mis-configured state after import
+(import failed with errors field not populated for cluster), the import and
+un-manage both the options would be enabled in UI. If user selects the import
+option now, it lands in import cluster view/page. If there was a previous import
+failed, then modal dialog shows up and message would be something like `Import
+cluster previously failed with <job_id>. Before import, you need to correct the
+issues and then un-manage the cluster`. This dialog has `Ok` and `Cancel`
+buttons.
+
+* If un-manage fails, it would provide a tooltip/info with failure message `If
+un-manage fails, resolve the issue and then try un-manage cluster again`. It
+would show a message to say `Unmanage Cluster` failed having a `View Details`
+hyperlink in the cluster list view.
+
 
 === Security impact: