polypath: Log pid of long-running interface monitor

[secnet] / CREDITS

Stephen Early <steve@greenend.org.uk> - original author
Ross Anderson, Eli Biham, Lars Knudsen - serpent
Colin Plumb, Ian Jackson - MD5 implementation
Ian Jackson - hacky parallelism, serpent keying and endianness bugfixes
Steve Reid <sreid@sea-to-sky.net>, James H. Brown <jbrown@burgoyne.com> - 
  SHA1 implementation
Cendio Systems AB - ipaddr.py
Mark Martinec <mark.martinec@ijs.si> - portable snprintf

Simon Tatham, Jonathan Amery, Ian Jackson - testing and debugging
Simon Tatham - RSA signatures using Chinese Remainder Theorem
Simon Tatham - endianness cleanups in transform.c
Richard Kettlewell, Peter Benie - assorted bugfixes