download asn1c from oai gitlab

We need to test at least one attach by the UEs of the test setup, to check that the local asn1c is the same as the one from github we used so far.

I don't think we need to do lots of traffic, it's only about control plane (rrc, s1ap).

And of course see if compilation is still ok.

See merge request !40

the official asn1c repository at github posed problems to
some people in the past. It's better to have it locally
for such a critical piece of the software.

This tracer takes the traces ENB_MAC_UE_DL_PDU_WITH_DATA
and ENB_MAC_UE_UL_PDU_WITH_DATA from a trace file
(as generated by the "record" tracer) and sends them
in UDP packets correctly formatted for wireshark to
dissect them.

One unresolved problem I face with my version of
wireshark (1.10.6) is that I don't get the frame number,
only subframe. See in the code to change the behavior
if you use a more recent version of wireshark.

You need to properly configure wireshark for it to work.
See $OPENAIR_DIR/openair2/UTIL/OPT/README.txt.

  - fix the run_enb_ue_virt_s1 script
  - change the Ki value back to the one used

fix gnutls download (closes #122)

Please merge this fix,

Regards,

Frédéric

See merge request !38

This reverts commit 3f20ce7b.

it was mistakenly pushed to develop

thanks to Supreeth Herle for reporting.

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