NFV&MEC Plugtests 2020: fixes of issues found during Plugtests

See merge request nfv/api-tests!106

- Fix Test ID headers (missing : and or space)
- Change 'clause' to 'Clause'
- Ensure references include 'ETSI GS'
- Fix index files for SOL002 and SOL003

SOL005 VNF Package Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!105

SOL005 NS Performance Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!104

SOL005 NS Lifecycle Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!103

Merge branch '2.6.1-dev-SOL005-NSLifecycleManagement-API' of https://forge.etsi.org/rep/stf/stf-583/api-tests into 2.6.1-dev-SOL005-NSLifecycleManagement-API

SOL005 NS Fault Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!102

# Conflicts:
#   SOL005/NSFaultManagement-API/Alarms.robot
#   SOL005/NSFaultManagement-API/Subscriptions.robot

SOL005 NSD Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!101

# Conflicts:
#   SOL005/NSDManagement-API/PNFDContent.robot

SOL003 Virtualised Resources Quota Available Notification - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!100

SOL003 Virtualised Resources Quota Available Notification - Implementation of deltas between v2.6.1 and v2.4.1

SOL003 VNF Package Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !99

SOL003 VNF Performance Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !98

SOL003 VNF Lifecycle Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !97

# Conflicts:
#   SOL003/VNFLifecycleManagement-API/IndividualVNFInstance.robot
#   SOL003/VNFLifecycleManagement-API/ScaleVNFTask.robot
#   SOL003/VNFLifecycleManagement-API/ScaleVNFToLevelTask.robot
#   SOL003/VNFLifecycleManagement-API/Subscriptions.robot
#   SOL003/VNFLifecycleManagement-API/TerminateVNFTask.robot
#   SOL003/VNFLifecycleManagement-API/VNFInstances.robot
#   SOL003/VNFLifecycleManagement-API/VnfLcmMntOperationKeywords.robot

SOL003 VNF Indicator - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !96

SOL003 VNF Fault Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !95

# Conflicts:
#   SOL003/VNFFaultManagement-API/FaultManagement-APIKeyword.robot
#   SOL003/VNFFaultManagement-API/Subscriptions.robot

SOL002/3/5 Tests for API version endpoints - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !94

SOL002 VNF Fault Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !93

# Conflicts:
#   SOL002/VNFFaultManagement-API/Alarms.robot
#   SOL002/VNFFaultManagement-API/Subscriptions.robot

SOL002 VNF Configuration - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !92

SOL002 VNF Indicator - Implementation of deltas between v2.6.1 and v2.4.1

See merge request !91

# Conflicts:
#   SOL002/VNFIndicator-API/VNFIndicators.robot
#   SOL002/VNFIndicator-API/VnfIndicatorsInVnfInstanceId.robot

SOL002 VNF Performance Management - Implementation of deltas between v2.6.1 and v2.4.1

See merge request nfv/api-tests!90

SOL002 VNF Lifecycle Management - Implementation of deltas between v2.6.1 and 2.4.1

See merge request nfv/api-tests!89

# Conflicts:
#   SOL002/VNFLifecycleManagement-API/IndividualVNFInstance.robot
#   SOL002/VNFLifecycleManagement-API/VnfLcmOperationKeywords.robot
#   SOL002/VNFLifecycleManagement-API/VnfLcmOperationOccurences.robot