security_dac: rework callback parameter passing
security_dac: rework callback parameter passing

Currently, the DAC security driver passes callback data as

    void params[2];
    params[0] = mgr;
    params[1] = def;

Clean this up by defining a structure for passing the callback
data.  Moreover, there's no need to pass the whole virDomainDef
in the callback as the only thing needed in the callbacks is
virSecurityLabelDefPtr.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Signed-off-by: Jim Fehlig <39929b5b86d72d51fceac59b52303e3fe8a3083e@suse.com>

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