[974][docker/cygnus-ngsi][Dockerfile] Use a single RUN a rollback to the re-cloning
[974][docker/cygnus-ngsi][Dockerfile] Use a single RUN a rollback to the re-cloning

telefonicaid/fiware-cygnus,Fiware/data.Cygnus,telefonicaid/fiware-cygnus,telefonicaid/fiware-cygnus,Fiware/data.Cygnus,telefonicaid/fiware-cygnus,Fiware/data.Cygnus,Fiware/context.Cygnus,Fiware/context.Cygnus,Fiware/context.Cygnus,Fiware/context.Cygnus