More warning fixes for kauth

More warning fixes for kauth

Resolve more minor warnings from the kauth directory.

*) kaux_read takes an unsigned for the number of failures
*) The COUNT_REQ macro generates an unused variable (this_op)
*) kas is missing some headers
*) Add some more prototypes to kauth_internal.h
*) Add the standard boilerplate to kauth_internal.h
*) recvfrom takes a socklen_t * as its 6th argument

This make kaprocs.c, kaauxdb.c, kas.c, klog.c, and ka-forwarder.c
warning clean. Mark them as such.

Reviewed-on: http://gerrit.openafs.org/673
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>