Query all external groups for internal group memberships

When asking for the known groups a user belongs to they may belong
to an internal group by way of membership in a non-internal group,
such as LDAP. Cache in memory the complete list of any non-internal
group UUIDs used as members of an internal group. These must get
checked for membership before completing the known group data from
the internal backend.

Change-Id: I10aef9f185915771deb58f4f180818c08e784ea3

gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/server/AccountGroupIncludeByUuidAccess.java

@@ -32,4 +32,7 @@ public interface AccountGroupIncludeByUuidAccess extends
 
   @Query("WHERE key.groupId = ?")
   ResultSet<AccountGroupIncludeByUuid> byGroup(AccountGroup.Id id) throws OrmException;
+
+  @Query("")
+  ResultSet<AccountGroupIncludeByUuid> all() throws OrmException;
 }