PCIe DevCap register is actually 32 bits, not 16 bits. Since FLR is
bit 28, we clearly are failing to detect FLR support.

Known to fix device reset with some SR-IOV devices.

* src/pci.c: fix pciDetectFunctionLevelReset()

daniel

* src/pci.c (pciGetDevice): Initialize dev->fd to -1, not 0.
(pciFreeDevice): Close fd also when it is 0.

* src/pci.c (pciIterDevices): Always close dir handle.

* configure.in po/POTFILES.in src/Makefile.am src/libvirt_private.syms
  src/pci.c src/pci.h: Add implementations of dettach, reattach and
  reset for PCI devices, patch by Mark McLoughlin
Daniel