Libiscsi: Adding transport layer into all library utilities

lib/init: initializing connection transport

lib/socket: Adding function to initialize tcp transport.
            future commits will include adding iSER transport layer,
            so each transport option will has it's own template of functions.

all_utils: All utils stay the same, in future iSER commits in case of
	   iSER transport we will override tcp_transport in
	   iscsi_context.

connect: adding transport initialization when creating context

include/iscsi-private: Adding iscsi_transport attribute in iscsi_context

Signed-off-by: Roy Shterman <roysh@mellanox.com>

Make iscsi_init_tcp_transport private

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

lib/socket.c

@@ -72,6 +72,14 @@
 #include "slist.h"
 
 static uint32_t iface_rr = 0;
+struct iscsi_transport;
+
+void iscsi_init_tcp_transport(struct iscsi_context *iscsi)
+{
+	iscsi->t = NULL;
+
+	return;
+}
 
 void
 iscsi_add_to_outqueue(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)