Comment 22 for bug 691590

Done with this commit in 0.9.9:
commit b43432931aef92325920953ff92beabfbe5224c8
Author: Eric Blake <email address hidden>
Date: Thu Dec 22 17:47:50 2011 -0700

    seclabel: allow a seclabel override on a disk src

    Implement the parsing and formatting of the XML addition of
    the previous commit. The new XML doesn't affect qemu command
    line, so we can now test round-trip XML->memory->XML handling.

    I chose to reuse the existing structure, even though per-device
    override doesn't use all of those fields, rather than create a
    new structure, in order to reuse more code.

    * src/conf/domain_conf.h (_virDomainDiskDef): Add seclabel member.
    * src/conf/domain_conf.c (virDomainDiskDefFree): Free it.
    (virSecurityLabelDefFree): New function.
    (virDomainDiskDefFormat): Print it.
    (virSecurityLabelDefFormat): Reduce output if model not present.
    (virDomainDiskDefParseXML): Alter signature, and parse seclabel.
    (virSecurityLabelDefParseXML): Split...
    (virSecurityLabelDefParseXMLHelper): ...into new helper.
    (virDomainDeviceDefParse, virDomainDefParseXML): Update callers.
    * tests/qemuxml2argvdata/qemuxml2argv-seclabel-dynamic-override.args:
    New file.
    * tests/qemuxml2xmltest.c (mymain): Enhance test.
    * tests/qemuxml2argvtest.c (mymain): Likewise.