Changes

s1ap_proxy_test: re-generate E-RAB RELEASE.{cmd,rsp} PDU blobs

These PDU blobs contained the right E-RAB-ID=6, but different
and unexpected {MME,ENB}-UE-S1AP-ID values.  As a result of this,
the E-RAB {7,9,6} that we establish in test_e_rab_setup/1 is never
released properly, and this is why we're seeing these two errors:

  E-RAB {1,0,6} is not registered (s1ap_proxy:handle_ie/2)
  E-RAB {2,1,6} is not registered (s1ap_proxy:handle_ie/2)

The new S1AP PDU blobs were re-generated using ttcn3-s1gw-test.

Change-Id: I229c47148fd7408e44f1339ae2a2909f570c73ec