default boolean isPasswordRequiredForSysadminsToJoinRoom() {
        return MUCPersistenceManager.getBooleanProperty( getServiceName(), "sysadmin.requires.room.passwords", false );
    }
Returns true when a system administrator of the MUC service can join a
password-protected room, without supplying the password.

@return false if a sysadmin can join a password-protected room without a password, otherwise true.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MultiUserChatService.java