Initial proof-of-concept SM-DP+ for GSMA consumer eSIM RSP

This commit introduces

* the osmo-smdpp.py program implementing the main procedures and the
  HTTP/REST based ES9+
* python modules for ES8+ and non-volatile RSP Session State storage
* the ASN.1 source files required to parse/encode RSP
* 3GPP test certificates from SGP.26
* an unsigned profile package (UPP) of a SAIP v2.3 TS48 test profile

As I couldn't get the 'Klein' tls support to work, the SM-DP+ code
currently does not support HTTPS/TLS but plan HTTP, so you either have
to modify your LPA to use HTTP instead of HTTPS, or put a TLS proxy in
front.

I have successfully installed an eSIM profile on a test eUICC that
contains certificate/key data within the test CI defined in GSMA SGP.26

Change-Id: I6232847432dc6920cd2bd08c84d7099c29ca1c11

smdpp-data/certs/DPtls/CERT_S_SM_DP4_TLS.ext.cnf

@@ -0,0 +1,14 @@
+######################################################################################################################################################################
+# Extensions for a DPTLS
+keyUsage = critical, digitalSignature
+extendedKeyUsage = critical, serverAuth, clientAuth
+certificatePolicies = 2.23.146.1.2.1.3
+subjectKeyIdentifier = hash
+authorityKeyIdentifier = keyid:always,issuer
+
+# RID shall be aligend with SGP.23 value SM-DP+OID4 
+# DNS name shall be aligned with SGP.23 value #TEST_DP_ADDRESS4
+subjectAltName =  DNS:testsmdpplus4.example.com, RID:2.999.14
+
+crlDistributionPoints=URI:http://ci.test.example.com/CRL-A.crl, URI:http://ci.test.example.com/CRL-B.crl
+