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[libvirt] [PATCHv2 0/4]add support usb redirection filter

v2 fixed:
(1) type int->size_t
(2) Don't output filter attributes with default -1 value in XML.
(3) Treat 0x0(0 decimal) as valid value for USB vendorID and productID
    as well as USB classID and bcdDevice code.
(4) doc fixed.

BZ RFE https://bugzilla.redhat.com/show_bug.cgi?id=795929
qemu support:

Since qemu has have the code to support USB redirection filter. This set of
patches try to support it from libvirt.
The input XML format is like this:
   <redirdev bus='usb' type='spicevmc'>
     <address type='usb' bus='0' port='4'/>
     <usbdev class='0x08' vendor='0x1234' product='0xbeef' \
             version='2.00' allow='yes'/>
     <usbdev allow='no'/>

Multiple <usbdev> element as one of filter rule could be added into parent
element <redirfilter>, only no more than <redirfilter> element could exists.
There is no 1:1 mapping between ports and redirected devices and qemu and
spicy client couldn't decide into which usbredir ports the client can 'plug'
redirected devices. So it make sense to apply all of filter rules global to
all existing usb redirection devices. class attribute is USB Class codes.
version is bcdDevice value of USB device. vendor and product is USB vendorId
and productId.
-1 can be used to allow any value for a field. Except allow attribute
the other four are optional, default value is -1.

The above XML will be converted to the following qemu command line:
If there are multiple usb-redir device, all of them have the same filter rules.
-device usb-redir,chardev=charredir0,id=redir0,\

Guannan Ren(0/4)
  qemu: define and parse USB redirection filter XML
  qemu: build USB redirection filter qemu command line
  test: add xml2argvtest for usb-redir filter and update
  doc: update usb redirection filter infomation on

 docs/formatdomain.html.in                                 |  38 +++++++++++------
 docs/schemas/domaincommon.rng                             |  66 +++++++++++++++++++++++++++++
 src/conf/domain_conf.c                                    | 339 +++++++++++++++++++++++++++++..
 src/conf/domain_conf.h                                    |  21 +++++++++
 src/qemu/qemu_command.c                                   |  45 +++++++++++++++++++-
 src/qemu/qemu_command.h                                   |   5 ++-
 src/qemu/qemu_hotplug.c                                   |   3 +-
 tests/qemuxml2argvdata/qemuxml2argv-usb-redir-filter.args |  10 +++++
 tests/qemuxml2argvdata/qemuxml2argv-usb-redir-filter.xml  |  45 ++++++++++++++++++++
 tests/qemuxml2argvtest.c                                  |   6 +++
 10 files changed, 559 insertions(+), 19 deletions(-)

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