Added ASN debug group to log low-level encoding/decoding (ASN.1, X.509).

This will allow us to remove quite some clutter from the LIB debug group
for higher debug levels.

man/ipsec.conf.5.in

@@ -1315,7 +1315,7 @@ A comma separated list containing type/level-pairs may
 be specified, e.g:
 .B dmn 3, ike 1, net -1.
 Acceptable values for types are
-.B dmn, mgr, ike, chd, job, cfg, knl, net, enc, lib, tls, tnc, imc, imv, pts
+.B dmn, mgr, ike, chd, job, cfg, knl, net, asn, enc, lib, tls, tnc, imc, imv, pts
 and the level is one of
 .B -1, 0, 1, 2, 3, 4
 (for silent, audit, control, controlmore, raw, private).  By default, the level

man/strongswan.conf.5.in

@@ -833,6 +833,9 @@ IPsec/Networking kernel interface
 .B net
 IKE network communication
 .TP
+.B asn
+Low-level encoding/decoding (ASN.1, X.509 etc.)
+.TP
 .B enc
 Packet encoding/decoding encryption/decryption operations
 .TP