Added 'getCreatorId()' method for VOSpace nodes.

        else:

            return False

    def getCreatorId(self, vospacePath):

        """Returns the creator ID for a given vospace path representing a node."""

        with self.getConnection() as conn:

            try:

                cursor = conn.cursor(cursor_factory = RealDictCursor)

                cursor.execute("""

                    SELECT creator_id

                    FROM node_vos_path nvp

                    JOIN node n ON nvp.node_id = n.node_id

                    WHERE vos_path = %s;

                    """, 

                    (vospacePath,))

                result = cursor.fetchall()

            except Exception as e:

                if not conn.closed:

                    conn.rollback()

                print(e)

        return result[0]["creator_id"]

    def getOSPath(self, vospacePath):

        """Returns a list containing full path, storage type and username for a VOSpace path."""

        with self.getConnection() as conn: