rework Indication flags

[jbdamiano]

Based on ETSI TS 129 274 V16.10.0 (2022-01) last revision new Indication flags have been added

The following bits within Octet 12 shall indicate:

• Bit 8 – CSRMFI (Create Session Request Message Forwarded Indication): if this bit is set to 1, it indicates that
  the Create Session Request message has been forwarded by a PGW, and the receiving PGW shall include its
  PGW FQDN in the Create Session Response message if the creation of the PDN connection is accepted.
• Bit 7 – MTEDTN (MT-EDT Not Applicable): if this bit is set to 1, it indicates that MT-EDT is not applicable for
  the PDN connection.
• Bit 6 – MTEDTA (MT-EDT Applicable): if this bit is set to 1, it indicates that MT-EDT is applicable for the
  PDN connection.

and
The following bits within Octet 13 shall indicate:

• Bit 8 to 5: Spare, for future use and set to 0.
• Bit 4 – SISSME (Same IWK-SCEF Selected for Monitoring Event Indication): if this bit is set to 1, it indicates
  that same IWK-SCEF is selected by target MME/SGSN for Monitoring Event.
• Bit 3 – NSENBI (Notify Source eNodeB Indication): if this bit is set to 1, it indicates that the source MME shall
  send a Handover Success to the source eNodeB (see clause 5.5.1.2.2a of 3GPP TS 23.401 [3]).
• Bit 2 – IDFUPF (Indirect Data Forwarding with UPF Indication): if this bit is set to 1, it indicates that indirect
  data forwarding is required for user plane routes from/to a UPF.
• Bit 1 – EMCI (Emergency PDU Session Indication): if this bit is set to 1, it indicates the UE has emergency
  PDU session, as specified in 3GPP TS 23.216 [43].

[RoadRunnr]

locks good, but please also adjust gen_v2_indication/0 in test/property_test/gtplib_prop.erl