claircore: invert flag to Vulnerability

See-also: https://issues.redhat.com/browse/CLAIRDEV-85
Change-Id: I4053d16eb2589dc2eb24fc194c19537b954e065d
Signed-off-by: Hank Donnay <hdonnay@redhat.com>

Author: hdonnay

vulnerability.go

@@ -50,6 +50,10 @@ type Vulnerability struct {
 	// For instances from a claircore "datastore" implementation, this will also
 	// include the "Self" alias.
 	Aliases []Alias
+
+	// Invert means this Vulnerability should be interpreted as an assertion
+	// that matched packages are NOT vulnerable to the indicated flaw.
+	Invert bool
 }
 
 // CheckVulnernableFunc takes a vulnerability and an indexRecord and checks if the record is