Added "load" method to NoOp class, which is now needed (NoOp hasn't
been enabled in a while).
Removed superfluous log message.
Optimized InfRcTransport to retrieve  multiple completions at a time
from the NIC (previously only got one at a time). This improved read
throughput from 812 kreads/sec. to 948 kreads/sec.
completions for multiple
Fixed race condition in TimeTrace (new events could be recorded while
printInternal was running, resulting in garbled printout).
Incorporated Yuta Higuchi's patch to allow ZooKeeper variables to
be overridden locally in GNUmakefile.