[CROSSDATA-569]Feature/docker marathon support (#658)
[CROSSDATA-569]Feature/docker marathon support (#658)

* Entrypoint with new environmental var XD_EXTERNAL_IP

* Entry point with RAM

miguel0afd/crossdata,jjlopezm/crossdata,miguel0afd/crossdata,compae/Crossdata,gserranojc/Crossdata,Stratio/crossdata,gserranojc/Crossdata,Stratio/crossdata,jjlopezm/crossdata,darroyocazorla/crossdata,hdominguez1989/Crossdata,hdominguez1989/Crossdata,pmadrigal/Crossdata,darroyocazorla/crossdata,pmadrigal/Crossdata,compae/Crossdata