Add secret "dynamic" flag to realms

Which adds mutexes to the RBtree for home server add and lookup.
i.e. the mutexes are likely to be contended, and therefore
slower
The variable name is "max_response_timeouts"
Just print out what we have for debugging.
Allow delayed references to attributes.  Helps with #711

The short answer for the issue is to use attribute references.

	if (&ldap-psec-Ldap-Group == "Professors") {
	    ...
	}

however, using "&" would result in an error.  This commit allows
the "&", which will make the check work.