Introduce support for XOR-2G algorithm

So far we supported a "xor" algorithm in osmo-hlr, without specifying
whether it's the XOR-3G or the (different) XOR-2G algorithm.

Furthermore, it was buggy in the sense that it permitted the XOR[-3G]
for 2G authentication data in the database.

This patch
* renames existing "xor" to "xor-3g"
* disallows "xor-3g" usage with 2G authentication data
* introduces support for XOR-2G as "xor-2g" in the VTY

Change-Id: I039a1f84fda54a908a82fe621e7fd078cb85e4c6
Depends: libosmocore.git I0ee0565382c1e4515d44ff9b1752685c0a66ae39
diff --git a/tests/db_upgrade/hlr_db_v0.sql b/tests/db_upgrade/hlr_db_v0.sql
index 46c985d..eb24eb5 100644
--- a/tests/db_upgrade/hlr_db_v0.sql
+++ b/tests/db_upgrade/hlr_db_v0.sql
@@ -61,7 +61,7 @@
 );
 INSERT INTO auc_2g VALUES(1,1,'BeefedCafeFaceAcedAddedDecadeFee');
 INSERT INTO auc_2g VALUES(4,2,'33333333333333333333333333333333');
-INSERT INTO auc_2g VALUES(6,4,'55555555555555555555555555555555');
+INSERT INTO auc_2g VALUES(6,6,'55555555555555555555555555555555');
 CREATE TABLE auc_3g (
 	subscriber_id	INTEGER PRIMARY KEY,	-- subscriber.id
 	algo_id_3g	INTEGER NOT NULL,	-- enum osmo_auth_algo value