Detail file polling issues

[Alan DeKok]

  Some people have seen the detail file listener go "crazy", and use
lots of CPU.  I've managed to reproduce the problem, and have committed
a fix to the "stable" tree.

  Please see http://git.freeradius.org/pre/  for tar files && debian
files containing the fix.  Or, see http://git.freeradius.org/ for
instructions on grabbing the latest "stable" code from git.

  Alan DeKok.