Change Applications Tier hostname using AutoConfig

1. Deregister the current Applications server (Required)
De-register the current Applications server node, run the following command as the owner of the Oracle Applications file system and current database instance as follow:
perl $AD_TOP/bin/adgentns.pl appspass= contextfile= -removeserver
2. Shutdown the Applications Tier Services (Required):
$COMMON_TOP/admin/scripts//adstpall.sh apps

3. Change the hostname as required:
Change the hostname in /etc/hosts file
4. Change the hostname as required:
Change the hostname in /etc/hosts file
5. Reboot the Node