CMS: add records for the updated VM

[katilp]

(From cernopendata/data-curation#124)

A new VM is provided with slc7 "CMS Shell". Build new records for
Image:

• similar to https://opendata-qa.cern.ch/record/257
• recid 258
• image version 1.6.0
  Contextualization files
• similar to https://opendata-qa.cern.ch/record/257
• recid 259

[katilp]

These files from /eos/opendata/cms/upload/vm160:

For recid 258

CMS-OpenData-1.6.0.ova

For recid 259

ucernvm-v4prod.2020.07-1.cernvm.x86_64.hdd
cernvm-script
cms-user-data.txt
opendata-desktop-settings

to be copied to /eos/opendata/cms/environment/1.6.0

[katilp]

Closed through #3552