libxl: implement virDomainInterfaceStats
Introduce support for domainInterfaceStats API call for querying network interface statistics. Consequently it also enables the use of `virsh domifstat <dom> <interface name>` command plus seeing the interfaces names instead of "-" when doing `virsh domiflist <dom>`. After successful guest creation we fill the network interfaces names based on domain, device id and append suffix if it's emulated in the following form: vif<domid>.<devid>[-emu]. We extract the network interfaces info from the libxl_domain_config object in libxlDomainCreateIfaceNames() to generate ifname. On domain cleanup we also clear ifname, in case it was set by libvirt (i.e. being prefixed with "vif"). We also skip these two steps in case the name of the interface was manually inserted by the administrator. Since the introduction of netprefix (commit a040ba9e), ifnames with a registered prefix will be freed on virDomain{Obj,Def}Format*, thus eliminating the migration issues observed with the reverted commit d2e5538b whereas source and destination would have the same ifname. For getting the interface statistics we resort to virNetInterfaceStats and let libvirt handle the platform specific nits. Note that the latter is not yet supported in FreeBSD. Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>
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