sockets are left in close_wait state by client under SSL

JIRA 1605 was still require after 1237 and more...
openssl SSL_shutdown return 1 when socket s freed.
see: SSL_shutdown() supports both uni- and bidirectional shutdown by its 2 step behaviour.

Current code in "ssl_utils.c" is : if(SSL_shutdown(ssl)==0) then SSL_free(ssl)

Should be:
SSL_shutdown_status = SSL_shutdown(ssl);
if (SSL_shutdown_status == 0)

SSL_free(ssl);

see attached patch file