Slice component functional with an script to generate batches of slices.

- Fixed L2NM service generation

- Updated deploy_specs

- Restored LoadGen default parameters

- Updated Netconf/OpenConfig log messages

- Updated Netconf/OpenConfig descriptor files
- Normalized variable names in OpenConfigDriver
- Minor code cleanup

- Reduced log levels to INFO
- Generalized paths
- Minor code and comment cleanup

Added SLA availability as percentage.

- Added indexes recommended by Cockroach internal planner to boost performance
- Added extra foreign-key indexes to enhance constraint validation

- Removed unneeded README.md file

- Updated number of 9's for availability

- Added new field availability in SLA Availability update

- Updated number of 9's for availability

- Updated number of 9's for availability

- Added indexes recommended by Cockroach internal planner to boost performance

- Added close connection to enable load balancing in requests

- Added availability percentage to SLA Availability constraint

- Removed availability percentage from SLA Availability constraint (new feature)

- Added availability percentage to SLA Availability constraint

- Added availability percentage to SLA Availability constraint

- Added availability percentage to SLA Availability constraint

- Removed availability percentage from SLA Availability constraint (new feature)

- Removed availability percentage from SLA Availability constraint (new feature)

- Removed availability percentage from SLA Availability constraint (new feature)

Addition of bindings for YANG "IETF Slice Service" data model parsing
Refactoring of subfolder "tools"

- Reduced number of digits to 2 in SLA values

- Rounded SLA values to 2 decimal digits

- Extracted constant MAX_WORKER_THREADS
- Rounded SLA values to 2 decimal digits

- Corrected method UnsetSlice to remove constraints

- Added logic to manage endpoints, constraints and config rules in Slice Grouping

- Added old test files