Allow dash and underscore in docker compose project name. 
Allow dash and underscore in docker compose project name. 

The release of docker compose version 1.21.1 added support for dashes and underscores in the project name.
When updating the `COMPOSE_PROJECT_NAME_SAFE` variable differs from the name docker-compose uses.

See commit : https://github.com/docker/compose/commit/5fe3aff1c310d6b8684404b19a8246736cfe8f1a#diff-a04be36073678de95917341f90c2cf58

This change updates the name normalization to match the 1.21.1 version of docker-compose.
docksal/docksal