Since AB has been changing the winbind interface it's time to add the "mock

Since AB has been changing the winbind interface it's time to add the "mock
swedish" test to client calls.  This is putting a length field at the
start of a request so we can disconnect clients talking with an out of date
libnss_winbind.so rather than deadlock them.

Misc cleanups:

 - made some int values uint32
 - moved WINBIND_INTERFACE_VERSION to start of cmd list