[Libvir] [PATCH] [RUBY-LIBVIRT]: Make the flags parameter optional

[Chris Lalancette]

All,
     While using the ruby-libvirt bindings, I usually end up setting the "flags"
parameter to various calls to 0.  While this is required by the C side of
things, for Ruby we have no such constraint; we can have methods with optional
arguments.  Since most of the time we will be passing "flags" as 0, we will just
assume 0 if it isn't specified, and actually use the value in flags if it is.
The attached patch does just that.  Note that I've only tested about half of the
calls in here; further breakage should be easy to find and fix.  Also note that
this should not impact existing users, since we will honor the flags they are
already passing.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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