Metacat

The systemmetadataChanged method is asynchronized, so we put the read-only checking on the ResourceHandler class.

Add the code to check if the mn is on the read-only mode.

Add the code to check if the metacat is in the read-only mode.

Add the code to handle the read-only mode.

Add a class to determine if the metacat is in the readonly mode.

Add the check that only the administrator can shrink the connection pool.

Close the sql statements on the four methods - getGUID, getHeadPID, systemMetadataSIDExist and systemMetadataPIDExist.

Close some prepared sql statement in the summarize method.

merge from branch: only check for d1 rightsholder when checking permissions in original metacat code base, otherwise legacy access control tests in metcat begin to fail. https://redmine.dataone.org/issues/7560

include check for d1 rightsholder when checking permissions in original metacat code base. https://redmine.dataone.org/issues/7560