This makes functions look just like in actual libvirt API, except
virStreamPtr is replaced with io.Reader for outgoing streams and
io.Writer for incoming streams.
- Bump the minimum libvirt version from 1.2.2 to 1.2.12, because
virDomainDefineXMLFlags wasn't introduced until that version.
- Use the correct format for the generated file notice, so that golint
ignores the generated files.
- Update libvirt.go so that all libvirt calls now go through the
generated routines.
- Remove some libvirt routines that had the same name as generated ones,
leave the rest as convenience routines.
- Fix the handling of Optional-values (the declarations of which in the
.x file look like pointers)
The generated wrappers have an argument for every field in their "Args"
struct, and return everything in their "Ret" struct (these structs are
defined in the protocol file, and identified by procedure name).
Marshaling and unmarshaling is handled inside the generated procedures.
