Changes

Add optonal e-RAB lists to HANDOVER messages

These lists are required to test release of e-RABs during handover
prparation and indication of failed e-RABS during handover resource
allocation.

New templates for the new lists and list items are added.

Related: SYS#7309
Change-Id: I78d2fa8e72bb672674727a01d5c5a9aaf31cab7b

S1GW: Add test case to test release of e-RABs during handover preperation

HANDOVER COMMAND allows e-EABs to be forwarded or to be released. The
test provides two lists and expects osmo-s1gw to release only those
e-RABs that are included int the "E-RABs to Release List" IE.

Related: SYS#7309
Change-Id: Ic70ba19c0a6e349f63aae124607d075b6d19e779

S1GW: Add test case to test release of failed e-RABs during handover resource allocation

HANDOVER REQUEST ACKNOWLEDGE indicates admitted and failed eRABs. The
test provides two lists and expects osmo-s1gw to release only those
e-RABs that are included int the "E-RABs Failed to Setup List" IE.

Related: SYS#7309
Change-Id: Ic14f560ae16b8386e58ac85f8af53b19d7c7a5c9