ReadOnly: Add a new command 'ctdb cattdb'. This fucntion differs from 'ctdb catdb...

ReadOnly: Add a new command 'ctdb cattdb'. This fucntion differs from 'ctdb catdb' in that 'cattdb' will always traverse the local tdb file only, while 'catdb' does a cluster traverse.

Since some record flags may differ between nodes in the cluster when read only delegations are in use, cattdb is needed when you need to know the exact flag settings on the current node itself.