This commit adds support for P4 device and
resource management by implementing:
 * key P4 entities as Python objects
 * a context class for turning P4 info files into context
 * common functions around P4
 * a manager class which exploits P4 entities and context to manage P4 devices
 * GetConfig() RPC
 * SetConfig() RPC, and
 * DeleteConfig() RPC
 * basic internal and unit tests

Signed-off-by: Georgios Katsikas <katsikas.gp@gmail.com>

- Arranged commit before merge
- Replaced string-based timestamps by context.Timestamp
- Created helper functions to convert timestamps string from/to float
- Arranged requirements to meet dependencies of converter functions

Common:
- Corrected Python package versions to prevent collisions with p4runtime

Context:
- Minor corrections in GitLab CI/CD pipeline

Device:
- Corrected Python package versions to prevent collisions with p4runtime

Monitoring:
- Arranged requirements to accelerate Docker image creation
- Corrected Python package versions to prevent collisions with p4runtime
- Updated Dockerfile
- Arranged GitLab CI/CD pipeline

Device:
- Removed obsoleted run_tests_locally-device.sh script
- Moved imports from *.proto folder to common.proto folder
- Removed device's genproto.sh script
- Minor code and linting fixing
- Arranged requirements to accelerate Docker image creation
- Updated Dockerfile
- Arranged GitLab CI/CD pipeline
- Corrected usage of ConfigRules to use new custom ConfigRules

Monitoring:
- Moved imports from *.proto folder to common.proto folder
- Removed monitoring's genproto.sh script

- OpenConfigDriver migrate from netconf_client to ncclient library
- Clean integration of Candidate datastore
- OpenConfigDriver code cleanup

new development of microwave device - implemented the Api to get configurations, create and delete services

- Implemented GetConfig/SetConfig/DeleteConfig
- Implemented unit tests for GetConfig/SetConfig/DeleteConfig
- Implementing simple DiscriteEventSimulator to emulate monitoring
- Remains to implement SubscribeState/UnsubscribeState/GetState
- Remains to implement unit tests for SubscribeState/UnsubscribeState/GetState

This reverts merge request !3