Hard-wire external associations: 3 sections in, this one is 4/7 (#645)

* Continue rebasing.

* Wrote unit tests for external associations.

* Fix the generated SQL.

Some syntactic sugar (capitalizing the keywords), but use the 'ON' syntax on JOINs.

* whitespace fix post rebase

* We want "management.cattle.io.projects:spec.displayName" not "...spec.clusterName"

* Fix the database calls: drop the key

* Fix breakage during automatic rebase merging gone wrong.

* ws fix - NFC

* Post rebase-merge fixes

* Fix rebase-driven merge.

* Fix rebase breakage.

* go-uber v0.5.2 prefers real arg names to '<argN>'

pkg/sqlcache/sqltypes/types.go

@@ -1,5 +1,7 @@
 package sqltypes
 
+import "k8s.io/apimachinery/pkg/runtime/schema"
+
 type Op string
 
 const (
@@ -69,6 +71,36 @@ type Pagination struct {
 	Page     int
 }
 
+type ExternalDependency struct {
+	SourceGVK            string
+	SourceFieldName      string
+	TargetGVK            string
+	TargetKeyFieldName   string
+	TargetFinalFieldName string
+}
+
+type ExternalLabelDependency struct {
+	SourceGVK            string
+	SourceLabelName      string
+	TargetGVK            string
+	TargetKeyFieldName   string
+	TargetFinalFieldName string
+}
+
+type ExternalGVKUpdates struct {
+	AffectedGVK               schema.GroupVersionKind
+	ExternalDependencies      []ExternalDependency
+	ExternalLabelDependencies []ExternalLabelDependency
+}
+
+type ExternalGVKDependency map[schema.GroupVersionKind]*ExternalGVKUpdates
+
+type ExternalInfoPacket struct {
+	ExternalDependencies      []ExternalDependency
+	ExternalLabelDependencies []ExternalLabelDependency
+	ExternalGVKDependencies   ExternalGVKDependency
+}
+
 func NewSortList() *SortList {
 	return &SortList{
 		SortDirectives: []Sort{},