Move all shared utility files to src/util/

* src/bridge.c, src/bridge.h, src/buf.c, src/buf.h, src/cgroup.c,
  src/cgroup.h, src/conf.c, src/conf.h, src/event.c, src/event.h,
  src/hash.c, src/hash.h, src/hostusb.c, src/hostusb.h,
  src/iptables.c, src/iptables.h, src/logging.c, src/logging.h,
  src/memory.c, src/memory.h, src/pci.c, src/pci.h, src/qparams.c,
  src/qparams.h, src/stats_linux.c, src/stats_linux.h,
  src/threads-pthread.c, src/threads-pthread.h, src/threads-win32.c,
  src/threads-win32.h, src/threads.c, src/threads.h, src/util.c,
  src/util.h, src/uuid.c, src/uuid.h, src/virterror.c,
  src/virterror_internal.h, src/xml.c, src/xml.h: Move all files
  into src/util/
* daemon/Makefile.am: Add -Isrc/util/ to build flags
* src/Makefile.am: Add -Isrc/util/ to build flags and update for
  moved files
* src/libvirt_private.syms: Export cgroup APIs since they're now
  in util rather than linking directly to drivers
* src/xen/xs_internal.c: Disable bogus virEventRemoveHandle call
  when built under PROXY
* proxy/Makefile.am: Update for changed file locations. Remove
  bogus build of event.c
* tools/Makefile.am, tests/Makefile.am: Add -Isrc/util/ to build flags

docs/apibuild.py

@@ -2089,11 +2089,11 @@ def rebuild():
     builder = None
     if glob.glob("../src/libvirt.c") != [] :
         print "Rebuilding API description for libvirt"
-	builder = docBuilder("libvirt", ["../src", "../include/libvirt"],
+	builder = docBuilder("libvirt", ["../src", "../src/util", "../include/libvirt"],
 	                     [])
     elif glob.glob("src/libvirt.c") != [] :
         print "Rebuilding API description for libvir"
-	builder = docBuilder("libvirt", ["src", "include/libvirt"],
+	builder = docBuilder("libvirt", ["src", "src/util", "include/libvirt"],
 	                     [])
     else:
         print "rebuild() failed, unable to guess the module"