CMS: update docker docs for the 2015 data and CMSSW_7_6_7 container

[katilp]

Update http://opendata.cern.ch/docs/cms-guide-docker for 2015 data

• Add a section for 2015 data
• or reorganize with one generic text and a list of <container image> - <CMSSW version> - data:
  • gitlab-registry.cern.ch/cms-cloud/cmssw-docker/cmssw_7_6_7-slc6_amd64_gcc493:latest - CMSSW_7_6_7 - 2105 pp
    • vnc to be added
  • cmsopendata/cmssw_5_3_32_vnc:latest - CMSSW_5_3_32 - 2011/2012 pp
    • alternative: gitlab-registry.cern.ch/cms-cloud/cmssw-docker-opendata/cmssw_5_3_32_vnc
  • cmsopendata/cmssw_4_2_8:latest - CMSSW_4_2_8 - 2010 pp
  • cmsopendata/cmssw_4_2_8_lowpupatch1:latest - CMSSW_4_2_8_lowpupatch1 - low-luminosity data with CASTOR calorimeter
  • gitlab-registry.cern.ch/cms-cloud/cmssw-docker/cmssw_4_4_7-slc5_amd64_gcc434 - CMSSW__4_4_7 - 2011 HI
  • gitlab-registry.cern.ch/cms-cloud/cmssw-docker/cmssw_3_9_2_patch5-slc5_amd64_gcc434 - CMSSW_3_9_2_patch5 - 2010 HI
• Reconsider if cvmfs description is needed, it is in contradiction with the current tutorial instructions
• Fix the broken link for the HI image, if not sorted out with the reorganization

[katilp]

Take also the occasion of

• pushing the missing images to cmsopendata area in dockerhub
  • the HI cmssw_3_9_2_patch5-slc5_amd64_gcc434 image
  • the new cmssw_7_6_7-slc6_amd64_gcc493 image
• make all the OD images available consistently from gitlab-registry.cern.ch/cms-cloud/cmssw-docker-opendata/ link
  • currently contains only the CMSSW_5_3_32 images (with and without vnc)
  • the other are in https://gitlab.cern.ch/cms-cloud/cmssw-docker/container_registry

[katilp]

@tpmccauley This is the issue we discussed, the images to be pushed to dockerhub and/or to gitlab-registry.cern.ch/cms-cloud/cmssw-docker-opendata/