outposts/ldap: Rework/improve LDAP search logic. (#1687)

* outposts/ldap: Refactor searching so we key primarily off base dn

* docs: Updating guides on sssd and the ldap outpost.

internal/outpost/ldap/constants/constants.go

@@ -1,5 +1,11 @@
 package constants
 
+const (
+	OCTop         = "top"
+	OCDomain      = "domain"
+	OCNSContainer = "nsContainer"
+)
+
 const (
 	OCGroup              = "group"
 	OCGroupOfUniqueNames = "groupOfUniqueNames"
@@ -19,3 +25,42 @@ const (
 	OUGroups        = "groups"
 	OUVirtualGroups = "virtual-groups"
 )
+
+func GetDomainOCs() map[string]bool {
+	return map[string]bool{
+		OCTop:    true,
+		OCDomain: true,
+	}
+}
+
+func GetContainerOCs() map[string]bool {
+	return map[string]bool{
+		OCTop:         true,
+		OCNSContainer: true,
+	}
+}
+
+func GetUserOCs() map[string]bool {
+	return map[string]bool{
+		OCUser:          true,
+		OCOrgPerson:     true,
+		OCInetOrgPerson: true,
+		OCAKUser:        true,
+	}
+}
+
+func GetGroupOCs() map[string]bool {
+	return map[string]bool{
+		OCGroup:              true,
+		OCGroupOfUniqueNames: true,
+		OCAKGroup:            true,
+	}
+}
+
+func GetVirtualGroupOCs() map[string]bool {
+	return map[string]bool{
+		OCGroup:              true,
+		OCGroupOfUniqueNames: true,
+		OCAKVirtualGroup:     true,
+	}
+}