Merge pull request #213 from shenrie/master

 Fix extended resource unit test
Print greenlets to stderr/file on SIGUSR2

With -n, output to stdout/stderr is blocked, so also dumps to a file ("gls-<pid>") on USR2.
Print PID in startup line
Made verbose repr for Endpoints be split over newlines
Fixes to manhole script for multiple manhole files/cleanup of dead ones
Process control flow must signal calling gl on reply-by short-circuit

Was causing a deadlock when reply-by already exceeded.
Merge pull request #215 from daf/OOIION-648

Process control flow must signal calling gl on reply-by short-circuit
Better test for process reply-by timeout
Add process context to local stack in endpoint for debugging purposes
Add process context to local stack for RPC too
Merge pull request #214 from daf/usr2_glreport

Print greenlets on USR2
Added debug statements to governance_controller