New Descriptor Loader Framework and OFC'22 code migrations

Common / descriptor loader framework:

• new generic descriptor loader tool
• new scenario loader for automated tests
• moved old Build/Load Descriptor scripts to common

Common / scripts:

• fixed show_logs_monitoring script

Common / Context Queries:

• added get_service, get_slice, get_topology methods
• corrected bug with get inter topology

Compute component:

• updated to use new context query methods
• updated to use new MockOSM location
• moved MockOSM library to common tests/tools folder

WebUI component:

• migrated JSON descriptor process to new DescriptorLoader tools

Tests:

• migrated MockOSM to generic tests/tools folder
• updated MockOSM constants and helper methods

OFC'22 tests:

• migrated tests to new DescriptorLoader tools
• updated MockOSM imports and test fixtures
• updated WIM service settings according to new MockOSM helper methods
• improved launch scripts
• added loggers
• improved verification of KPIs created and values returned
• optimized removal of entities
• optimized service discovery in delete test
• added on-line logging to tests

Tutorials:

• improved descriptions of OFC'22 tutorials