* src/lxc/lxc_driver.c src/lxc/lxc_controller.c: before launching the
  lxc controller, have the lxc driver query the log settings and setup
  envp[]. This provides the advantage of honoring the actual log
  configuration instead of only what had been set in the environment.
  The lxc controller now simply has to call virLogSetFromEnv().