Improve RTD projects branches activation

Improve RTD projects branches activation

Some projects branches need to be manually activated by docs maintainers
with a script and a RTD personnal token.
This is especially true for MRI projects
Though, the current script only allows MSI projects activation.

- remove MRI projects from the old script mostly targeting MSI projects
- create a MRI projects versions list in TSV format
- copy/paste old script and adapt it quickly and dirtily
  to activate and build MRI projects branches

Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: Ia9fa2c61c012970398d204196d5be78925374c34