Deactivated some Device monitoring functionality partially implemented to enable a functional commit into develop.

Device:
- Implemented Driver API with some special resources to enable retrieving endpoints from devices, interfaces, and network instances.
- Implemented special resource_keys (_connect/*) to enable AddDevice to obtain settings used to connect to remote devices (address, port, username, password, etc.)
- Implemented Emulated Driver (only for testing)
- Implemented OpenConfig Driver (missing to implement monitoring; templates for Infinera devices to be tested with other device vendors)
- Minor bugs and code improvements
- Improved test unit to enable easy testing of vendor devices and keep credentials secret.

- reorganized some files and modules
- implemented discovery of device endpoints for OpenConfig driver
- implemented retrieval of current configuration for OpenConfig driver
- updated test units and separated in emulated and openconfig test sets

- added missing proto files in genproto.sh
- created .gitignore files to prevent sharing device credentials and data
- improved MonitoringLoops class with one thread per driver for data collection, a unique aggregation queue and one single thread for data export to monitoring
- added GetResource method to Driver API
- improved DriverFactory to select the driver that better fits with filter fields in terms of number of correspondences in filter fields. Drivers with some mismatch filter are discarded.
- implemented proper initialization and connection of drivers to real devices
- started to implement OpenConfig driver with support for Infinera Packet Routers

- Implemented Database models for KpiModel and KpiSampleType
- Added MonitorDeviceKpi to DeviceClient
- Added MonitorDeviceKpi to DeviceServiceServicerImpl (partial implementation)
- Created MonitoringLoops class (partial implementation)

- Subscriptions to be implemented

Common:
- Normalized report_coverage_*.sh scripts, and temporarily summarized results in device one for testing purposes.
- Adapted run_tests_locally.sh script for testing purposes
- Improved message synthesis of ServiceException

Context:
- Improved ConfigModel helper functions

Device (intermediate backup):
- Removed DataCache since it reduces readability of the code. Moved database one level up.
- Improved ServicerImpl and moved DataCache functionality over there.
- Added condition to prevent AddDevice request from carrying a configuration.
- Multiple pre-work required for processing configuration differences in DeviceServiceServicerImpl.

- Added method to delete config rules when action is DELETE.
- Temporary changes in run_tests_local.sh scripts

- Multiple minor bug resolutions
- DeviceClient: solved logging bug
- EmulatedDriver: solved GetConfig bug and added event to prevent double connection requests
- DriverInstanceCache, DriverFactory: Added formatting of filter fields
- DataCache: solved minor bug
- DriverAPI test unit: corrected getconfig assertion check
- Device test unit: reimplemented, first complete test after component reworking
- DataCache/DeviceTools: solved several minor bugs
- DeviceServiceServicerImpl: added removal of drivers and endpoints when device is removed.