util: use netlink to create bridge devices
    
    Just as it is possible to delete a bridge device with the netlink
    RTM_DELLINK message, one can be created with the RTM_NEWLINK
    message. Because of differences in the format of the message, it's not
    as straightforward as with virNetlinkDelLink() to create a single
    utility function that can be used to create any type of interface, so
    the new netlink version of virNetDevBridgeCreate() does its own
    construction of the netlink message and calls virNetlinkCommand()
    itself.
    
    This doesn't provide any extra functionality, just provides symmetry
    with the previous commit.
    
    NB: We *could* alter the API of virNetDevBridgeCreate() to take a MAC
    address, and directly program that mac address into the bridge (by
    adding an IFLA_ADDRESS attribute, as is done in
    virNetDevMacVLanCreate()) rather than separately creating the "dummy
    tap" (e.g. virbr0-nic) to maintain a fixed mac address on the bridge,
    but the commit history of virnetdevbridge.c shows that the presence of
    this dummy tap is essential in some older versions of the kernel
    (between 2.6.39 and 3.1 or 3.2, possibly?) to proper operation of IPv6
    DAD, and I don't want to take the chance of breaking something that I
    don't have the time/setup to test (my RHEL6 box is at kernel
    2.6.32-544, and the next lowest kernel I have is 3.17)