lxc: Init activeUsbHostdevs
lxc: Init activeUsbHostdevs

otherwise we crash with

 #0  virUSBDeviceListFind (list=0x0, dev=dev@entry=0x8193d70) at util/virusb.c:526
 #1  0xb1a4995b in virLXCPrepareHostdevUSBDevices (driver=driver@entry=0x815d9a0, name=0x815dbf8 "debian-700267", list=list@entry=0x81d8f08) at lxc/lxc_hostdev.c:88
 #2  0xb1a49fce in virLXCPrepareHostUSBDevices (def=0x8193af8, driver=0x815d9a0) at lxc/lxc_hostdev.c:261
 #3  virLXCPrepareHostDevices (driver=driver@entry=0x815d9a0, def=0x8193af8) at lxc/lxc_hostdev.c:328
 #4  0xb1a4c5b1 in virLXCProcessStart (conn=0x817d3f8, driver=driver@entry=0x815d9a0, vm=vm@entry=0x8190908, autoDestroy=autoDestroy@entry=false, reason=reason@entry=VIR_DOMAIN_RUNNING_BOOTED)
     at lxc/lxc_process.c:1068
 #5  0xb1a57e00 in lxcDomainStartWithFlags (dom=dom@entry=0x815e460, flags=flags@entry=0) at lxc/lxc_driver.c:1014
 #6  0xb1a57fc3 in lxcDomainStart (dom=0x815e460) at lxc/lxc_driver.c:1046
 #7  0xb79c8375 in virDomainCreate (domain=domain@entry=0x815e460) at libvirt.c:8450
 #8  0x08078959 in remoteDispatchDomainCreate (args=0x81920a0, rerr=0xb65c21d0, client=0xb0d00490, server=<optimized out>, msg=<optimized out>) at remote_dispatch.h:1066
 #9  remoteDispatchDomainCreateHelper (server=0x80c4928, client=0xb0d00490, msg=0xb0d005b0, rerr=0xb65c21d0, args=0x81920a0, ret=0x815d208) at remote_dispatch.h:1044
 #10 0xb7a36901 in virNetServerProgramDispatchCall (msg=0xb0d005b0, client=0xb0d00490, server=0x80c4928, prog=0x80c6438) at rpc/virnetserverprogram.c:432
 #11 virNetServerProgramDispatch (prog=0x80c6438, server=server@entry=0x80c4928, client=0xb0d00490, msg=0xb0d005b0) at rpc/virnetserverprogram.c:305
 #12 0xb7a300a7 in virNetServerProcessMsg (msg=<optimized out>, prog=<optimized out>, client=<optimized out>, srv=0x80c4928) at rpc/virnetserver.c:162
 #13 virNetServerHandleJob (jobOpaque=0xb0d00510, opaque=0x80c4928) at rpc/virnetserver.c:183
 #14 0xb7924f98 in virThreadPoolWorker (opaque=opaque@entry=0x80a94b0) at util/virthreadpool.c:144
 #15 0xb7924515 in virThreadHelper (data=0x80a9440) at util/virthreadpthread.c:161
 #16 0xb7887c39 in start_thread (arg=0xb65c2b70) at pthread_create.c:304
 #17 0xb77eb78e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

when adding a domain with a usb device. This is Debian bug

    http://bugs.debian.org/700267

jfehlig/libvirt,taget/libvirt,libvirt/libvirt,jardasgit/libvirt,olafhering/libvirt,eskultety/libvirt,olafhering/libvirt,andreabolognani/libvirt,eskultety/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,nertpinx/libvirt,cbosdo/libvirt,shugaoye/libvirt,eskultety/libvirt,crobinso/libvirt,andreabolognani/libvirt,jardasgit/libvirt,agx/libvirt,andreabolognani/libvirt,shugaoye/libvirt,rlaager/libvirt,datto/libvirt,crobinso/libvirt,datto/libvirt,nertpinx/libvirt,nertpinx/libvirt,jfehlig/libvirt,eskultety/libvirt,datto/libvirt,eskultety/libvirt,taget/libvirt,agx/libvirt,rlaager/libvirt,shugaoye/libvirt,zippy2/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,datto/libvirt,libvirt/libvirt,taget/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,jardasgit/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,fabianfreyer/libvirt,elmarco/libvirt,VenkatDatta/libvirt,shugaoye/libvirt,agx/libvirt,cbosdo/libvirt,cbosdo/libvirt,jfehlig/libvirt,rlaager/libvirt,taget/libvirt,agx/libvirt,shugaoye/libvirt,agx/libvirt,elmarco/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,olafhering/libvirt,olafhering/libvirt,crobinso/libvirt,VenkatDatta/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,zippy2/libvirt,elmarco/libvirt,andreabolognani/libvirt,datto/libvirt,nertpinx/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,elmarco/libvirt,libvirt/libvirt,crobinso/libvirt,taget/libvirt,zippy2/libvirt,zippy2/libvirt,jfehlig/libvirt