identification: Use UTF8String instead of the legacy T61String to encode DNs

When strings in RDNs contain characters outside the character set for
PrintableString use UTF8String as the passed string is most likely in
that encoding (RFC 5280 actually recommends to use only those two
string types).

src/libstrongswan/utils/identification.c

@@ -478,7 +478,7 @@ static status_t atodn(char *src, chunk_t *dn)
 					name.len -= whitespace;
 					rdn_type = (x501rdns[i].type == ASN1_PRINTABLESTRING
 								&& !asn1_is_printablestring(name))
-								? ASN1_T61STRING : x501rdns[i].type;
+								? ASN1_UTF8STRING : x501rdns[i].type;
 
 					if (rdn_count < RDN_MAX)
 					{