r4769: added a smb_composite_connect() function that provides a simple async

interface to a complete SMB connection setup. Internally it does:

  - socket connection
  - session request (if needed)
  - negprot
  - session setup
  - tcon

This is the first example of a composite function that builds on other
composite components (the socket connection is a composite function,
which is used as a building block for this function). I think this
will be quite common in composite functions in the future, building up
ever more complex composite functions from smaller building blocks,
while hiding the details from the caller.

There are two things missing from this now. The first is async name
resolution routines (wins, bcast, DNS etc), and the second is that
this code currently only does a NT1 style session setup. I'll work on
adding spnego and old style session setup support next.

source/include/structs.h

@@ -141,3 +141,4 @@ struct ldb_val;
 struct smbcli_composite;
 struct smb_composite_loadfile;
 struct smb_composite_savefile;
+struct smb_composite_connect;