[APIS-955] fix CLOSET_SOCKET macro

[kisoo-han]

http://jira.cubrid.org/browse/APIS-955

Description

• When a cci handle is returned, hm_con_handle_free() closes the connected socket associated with the cci handle.
• If the socket descriptor associated with the cci handle is a value other than -1, the connection is closed regardless of whether it was created by another thread.
• When net_connect_srv () received negative answer from the CAS, it should not only close that connection, but also set the sd connected to the relevant cci handle to -1 (INVALID_SOCKET).
• If not, a socket created by another thread could be closed.