Eric Blake c47f6aad95 blockjob: split up virsh blockjob info
I have plans to make future enhancements to the job list mode,
which will be easier to do if the common blockJobImpl function
is not mixing a query command with multiple modify commands.
Besides, it just feels weird that all callers to blockJobImpl
had to supply both a bandwidth input argument (unused for info
mode) and an info output argument (unused for all other modes);
not to mention I just made similar cleanups on the libvirtd
side.

The only reason blockJobImpl returned int was because of info
mode returning -1/0/1 (all other job API are -1/0), so that
can also be cleaned up.  No user-visible changes in this commit.

* tools/virsh-domain.c (blockJobImpl): Change signature and return
value.  Drop info handling.
(cmdBlockJob): Handle info here.
(cmdBlockCommit, cmdBlockCopy, cmdBlockPull): Adjust callers.

Signed-off-by: Eric Blake <eblake@redhat.com>
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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