qemu: Add defines for the new throttle options

Add defines for the new options total_bytes_sec_max, write_bytes_sec_max, read_bytes_sec_max
total_iops_sec_max, write_iops_sec_max, read_iops_sec_max, size_iops_sec.
qemu: Add new throttle options to the structure _virDomainBlockIoTuneInfo.

Modify the structure _virDomainBlockIoTuneInfo to suport total_bytes_sec_max, write_bytes_sec_max,
read_bytes_sec_max, total_iops_sec_max, write_iops_sec_max, read_iops_sec_max, size_iops_sec options.

Add the bool suport_max_options in the sturture _virDomainBlockIoTuneInfo used to know
if the qemu binary suport the bps_max options and they friends.

Change the initialisation of the variable expectedInfo in the test file qemumonitorjsontest.c
to avoid compilling problem.
qemu: Add the capabilitie to detect if the qemu binary have the capability to use bps_max and friends

Add a value in the enum virQEMUCapsFlags for the qemu capability.
Set it with virQEMUCapsSet if the binary suport bps_max and they friends.
qemu: Add bps_max and friends qemu driver

Add suport for bps_max and friends in the driver part.
In the part checking if a qemu is running, check if the running binary suport bps_max,
if not prrint an error message, if yes add it to "info" variable
qemu: Add bps_max and friend to domain_conf

Allow qemu driver to save the configuration use by bps_max and they friends.
qemu: Add bps_max and friends QMP suport

Detect if the the qemu binary currently in use suport the bps_max option,
If yes add it to the command, if not, just ignore the options.
qemu: Add bps_max and friends "text" suport

Detect if the the qemu binary currentely in use suport the bps_max option and thy firends,
If yes add it to the commande, if not, just ignore the options.
qemu: add bps_max and friends to qemu command genaration

Check the avability of the options with the current qemu binary, add them in the varable opt if yes,
print a message if not.
qemu: Add bps_max and friends to virsh

Add the new throttle options to virsh, and send them to libvirt.