Update to !1427: Make primary's transfer log more detailed
Two enhancements are added:
Insist on TCP in xfrout_senddone, since this is now only called with a TCP client and it relies on it for counting the number of bytes statistics.
Add a test for checking the right number of bytes when dig performs IXFR over UDP.
In addition, some style changes are made to make more consistent usage of tabs and pointer placement in the