Upgrade Marketplace Packages along with server upgrade

While upgrading the Nuxeo Debian package, the MP are uninstalled (but not removed), then the server is upgraded without reinstalling the MP.
They should be at least downloaded in a compliant version.
Make use of the nuxeoctl commands:

• mp-set
• mp-request
• mp-list
• ...
  and options such as --json

Naively expected behavior:

• if the server is started, stop it
• upgrade
• use "mp-upgrade"
• or use "mp-set" and check the MP compliance
• in case of compliant MP not found, log error and ends without starting the server (if it has been stopped)
• if the new configuration is valid, start the server (if it has been stopped)

New options in nuxeoctl may be needed to improve the script but current "--relax" option set to false should be enough.