Solution import script should exit early if trying to import the same solution from a different ISO

[alexandre-allard]

Component: solutions, scripts

What happened:
Trying to import a Solution already present with a different archive (in the same version), we end up with a not user friendly Salt error:

2021-02-11 09:38:39,311 [salt.state       :3607][CRITICAL][27035] Rendering SLS 'metalk8s-2.6.0:metalk8s.solutions.available' failed: while constructing a mapping
  in "<unicode string>", line 6, column 1
found conflicting ID 'Mountpoint for Solution hyperdrive 0.2.2 exists'
  in "<unicode string>", line 49, column 1

What was expected:
The script bails out early with a nice and clear error message.

Steps to reproduce:

• Import a solution ISO
• Make a copy of it
• Import this copy

Resolution proposal (optional):
Check the content of the archive in metalk8s_solutions.configure_archive Salt module and exit with a clear error message if there already is an archive providing the same "solution name" + "version" couple.