Display the xcat management network congiguration
Display the xcat management network congiguration

When the error happens, give more info to the user

Change-Id: Ied4c794d35296fbc0b7700318e61238da84cdcb8

mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk