iRODS: v2 (remote pgsql, tiering, bugfixes, variables and new certificate)

[scimerman]

• added tiering playbook that configure 3 levels data migration
• split configuration for icat.yml into _pre configuration and main configuration
• added pgsql_remote.yml playbook, to configure icat to use remote sql server
  • added bugfixes (templates/database_connect.py - used only on irods-server version 4.2.11) to correctly use the ssl when using remote pgsql server
• moved the pgsql.yml into postgres _local, as to differentiate from the pgsql_remote.yml
• updated readme file
• shortened and consolidated variable names
  • secret variables and now called icat_ and irods_ to avoid confusion
  • non-secret irods_ variable are now shortened to ir_ to save space and avoid further confusion
• custom variable per machine:
  • custom variables are now using variables from static_inventory
    • if those are missing, they use group variables
    • if also those are also missing, they use default playbook variables
  • secret variables per machine, are now linked to ones defined secrets.yml, f.e. in static_inventories/nibbler_cluster.yml

    irods-catalogus:
         ir_db_pwd: '{{ icat_test_db_pwd }}'   # for the test machine, vs
    irods-catalogus:
         ir_db_pwd: '{{ icat_db_pwd }}'        # for the production machine
    

• uploaded new key (encrypted) and certificate (unencrypted) for the umcg-icat01.gcc.rug.nl
  (followed the convention of intermediate certificates order - sorted them correctly)
• updated davrods configuration: port definition in docker-compose and ServerName in vhost.conf ended in error due to new docker version

[pneerincx]

Wow, large PR :) Looks mostly good. A few minor issues/suggestions. See inline comments.

[pneerincx]

See 2 more inline comments.

[pneerincx]

Small YAML indentation issue in playbook; see inline comment.