Allow mom to join herself to the cluster without needing a qmgr command

Follow the PBS Pro Design Document Guidelines.

Overview

When the site is using a secure authentication protocol like MUNGE, the server does not have to rely on the qmgr create node command to trust the mom. The proposed design will allow the mom to create the natural node and join herself to the cluster without needing an explicit qmgr command.

The server will make sure that the exception is allowed only while having a secure environment and by checking the PBS_AUTH_METHOD=MUNGE.

The name of the natural node will be the non-canonicalized hostname returned by gethostname(). This can be changed using PBS_MOM_NODE_NAME.

qmgr create/delete node operation will still be honoured.