include: Add new definitions for duration for bps/iops throttling
include: Add new definitions for duration for bps/iops throttling

Add new options to allow proving a duration/length in seconds to allow the
bps/iops (and friends) to occur:

    total_bytes_sec_max_length
    write_bytes_sec_max_length
    read_bytes_sec_max_length
    total_iops_sec_max_length
    write_iops_sec_max_length
    read_iops_sec_max_length

Add continue for compiler hint to return to for control

crobinso/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,eskultety/libvirt,datto/libvirt,datto/libvirt,nertpinx/libvirt,olafhering/libvirt,fabianfreyer/libvirt,datto/libvirt,fabianfreyer/libvirt,taget/libvirt,jfehlig/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,taget/libvirt,crobinso/libvirt,olafhering/libvirt,fabianfreyer/libvirt,datto/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,taget/libvirt,eskultety/libvirt,jfehlig/libvirt,libvirt/libvirt,VenkatDatta/libvirt,eskultety/libvirt,andreabolognani/libvirt,taget/libvirt,andreabolognani/libvirt,libvirt/libvirt,jardasgit/libvirt,zippy2/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,libvirt/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,zippy2/libvirt,eskultety/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,datto/libvirt,crobinso/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,taget/libvirt,jardasgit/libvirt,crobinso/libvirt,nertpinx/libvirt