Add m_validity_restriction_unknown template to initialise ValidityRestriction variables in test cases

Fixed selector for matching.
Harmonized handling of unknown UT messages, e.g. UtGnEventIndications.

LibItsDenm_Templates:
1) mw_denmMgmtCon
- relevanceDistance and relevanceTrafficDirection are optional from ASN.1, is it indented to set '?' here? I change it to '*'.

ItsDenm_TpFunctions:
1) f_DEN_EVGN_BV_03
- The UT trigger returns us the actionID, so we should use it.
2) f_DEN_EVUP_BV_03, f_DEN_EVTR_BV_08
- v_diff could be of the same type as v_referenceTime1 and v_timestampIts, from where the diff is done
- v_timestampIts is the newer time than v_referenceTime1, so should the diff be
  v_diff := v_referenceTime1 - v_timestampIts; (negative value?)
or
  v_diff := v_timestampIts - v_referenceTime1; (positive value)
I have chosen now the last option.
3) f_DEN_EVTR_BV_03, f_DEN_KAFW_BV_02, f_DEN_KAFW_BV_06
- fixed position of parameters for mw_denmMgmtConTermination.
4) f_DEN_EVTR_BO_06
- TP saying own stationID, so let's directly use it. However it might be that I misinterpret now the NOTE.

f_GEONW_PON_TSB_BO_07_nodeB: Clearing vc_utInds, fixed sync point.
f_GEONW_PON_GAC_BO_09_nodeB: Initializing GN packet, clearing vc_utInds.

PICS_GN_BEACON_SERVICE_MAX_JITTER default value set to 750 as specified in ETSI EN 302 636-4-1 V1.2.1 - itsGnBeaconServiceRetransmitTimer / 4 => 3000 /4 = 750.

Remove f_sleep due to side effect: all UT messages were trapped by a_utDefault() while f_sleep is running

Add a_shutdown altstep
Move f_prInitialState() into f_cfUp()

In receive templates, replace default value ? for p_validityDuration by * because of in ASN.1, a DEFAULT value constraint could be replaced by an omit

Add PICS_IUT_CERTIFICATES_PUSHING

Introduce PX_IUT_STATION_TYPE pixit
Bug fixed in function f_poCancelEvent()

Change AID for CAM to 36
Change AID for CAM to 37
Add logs on function failure
Set vc_hashedId8ToBeUsed to 'FFFFFFFFFFFFFFFF'O in case of the IUT can not manage test certificates

Validation CAM/DENM with Commsignia IUT: Remove useless trafficClass field in UtDenmTrigger & UtDenmUpdate commands