- Corrected methods wait_for_environment_variables and find_missing_environment_variables

- Added helper method to find missing environment variables in microservices

- Added/Updated headers
- Added script to update copyright headers

- defined unified constants for all micro-services
- defined common settings getter methods
- defined generic gRPC servicer
- defined generic Rest servicer
- defined common MockServicer for Monitoring component
- removed old common/tests MockService class; to be replaced by new generic gRPC servicer
- minor code formatting/styling

- Added REST API Server to Compute component
- Factorized get settings from environment variabes into common method get_setting