Guannan Ren c65fc29a31 python: set default value to optional arguments
When prefixing with string (optional) or optional in the description
of arguments to libvirt C APIs, in python, these arguments will be
set as optional arugments, for example:

 * virDomainSaveFlags:
 * @domain: a domain object
 * @to: path for the output file
 * @dxml: (optional) XML config for adjusting guest xml used on restore
 * @flags: bitwise-OR of virDomainSaveRestoreFlags

 the corresponding python APIs is
 restoreFlags(self, frm, dxml=None, flags=0)

The following python APIs are changed to:
 blockCommit(self, disk, base, top, bandwidth=0, flags=0)
 blockPull(self, disk, bandwidth=0, flags=0)
 blockRebase(self, disk, base, bandwidth=0, flags=0)
 migrate(self, dconn, flags=0, dname=None, uri=None, bandwidth=0)
 migrate2(self, dconn, dxml=None, flags=0, dname=None, uri=None, bandwidth=0)
 migrateToURI(self, duri, flags=0, dname=None, bandwidth=0)
 migrateToURI2(self, dconnuri=None, miguri=None, dxml=None, flags=0, \
               dname=None, bandwidth=0)
 saveFlags(self, to, dxml=None, flags=0)
 migrate(self, domain, flags=0, dname=None, uri=None, bandwidth=0)
 migrate2(self, domain, dxml=None, flags=0, dname=None, uri=None, bandwidth=0)
 restoreFlags(self, frm, dxml=None, flags=0)
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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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