Fix for problem with reuse of IP adress for new nodes

Fix for problem with reuse of IP adress for new nodes

AppManager has a problem when you reuse an Ip adress from an old server for a new server. Appmanager  will report the new server as  Unknown server host name 'l"DNS name"’ 
Currently it requires a script from support to reset this every time.
Appmanager should be able to support this functionality out of the box

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