Context Scalability extensions using CockroachDB + Removal of Stateful database inside Device + other

Deploy scripts:

• Aggregated deploy scripts in folder "deploy"
• Added deploy scripts for CockroachDB and NATS
• Updated my_deploy.sh example deployment definition script

Manifests:

• Migrated old GitLab.com URLs to ETSI Labs
• Reduced default number of replicas of components to 1

GitLab CI/CD pipeline:

• Updated and homogeneized definitions
• Disabled deployment in Kubernetes due to changes in GitLab agents (not needed by now)

Common:

• Added method in method_wrappers to dump component performance during unit tests
• Updated Event handling to consider new timestamp structure in context.proto
• Updated MockServiceImpl_Context to log reply messages
• Updated context_queries with new method to get devices and reduced log messages
• Updated object_factory with missing methods and corrected existing ones
• Updated old Constants DEFAULT_CONTEXT_UUID, DEFAULT_TOPOLOGY_UUID and INTERDOMAIN_TOPOLOGY_UUID to ..._NAME
• Updated common requirements

Context component:

• Migrated Context to CockroachDB and NATS
• Defined new Context ORM based on SQLAlchemy and CockroachDB engine
• Updated context.proto and Context component to include name fields in main entities
• Updated context.proto to include slice_ids in Context message
• Updated unitary tests and GitLab CI/CD pipeline accordingly

Device component:

• Removed internal stateful database and replaced by requests-replies to context
• Extended MonitoringLoops to keep track of monitorable endpoints as an efficient in-memory database
• Added logic to pre-load drivers for existing devices in Context when Device component starts
• Reorganized code and separated in relevant modules and classes to improve readability
• Updated unitary tests accordingly
• EmulatedDriver: Reorganized code and separated in relevant modules and classes
• EmulatedDriver: Minor updates to arrange with removal of the internal database
• OpenConfigDriver: Minor updates to arrange with removal of the internal database

DLT component:

• Corrected CI/CD pipeline to prevent using a network with fixed IP address ranges

Load Generator component:

• Generalized load_generator tool to be executable as a command line and/or component
• Added load_generator.proto to control the load_generator component
• Added parameter to enable setting up services and slices, but not tearing them down.
• Added parameter to generate infinite requests
• Adapted parameter generation for services and slices to new definition of service/slice in context

Compute component:

• Moved code to debug content of context to Compute to convert it into a debug_api NBI (by now WIP)

Monitoring component:

• Corrected many small issues in unitary tests

PathComp component:

• Corrected composition of requests for the Backend to be consistent with context definitions
• Improved logging of request sent to backend
• Corrected CI/CD pipeline to prevent using a network with fixed IP address ranges

Service component:

• Corrected CI/CD pipeline to use real context, device, and service images; otherwise crashes

WebUI component:

• Added basic buttons to control Load Generator component
• Corrected logic to handle selection of context/topology
• Added field "name" in many entities (WIP)
• Disabled Dump ContextDB links
• Improved listing of configuration rules of device, service and slice

Misc:

• Many minor bug resolutions, code formatting, and cosmetic changes
• Updated README.md file