NSFS | NC | Update system.json structure + small redirect fix

[romayalon]

Explain the changes

1. Since system.json might be shared between hosts we need to update the system.json structure to reflect the system per hostname.
   The new structure is of the following format -

{
  'hostname1': {
    current_version: '5.15.2',
    upgrade_history: { successful_upgrades: [ { timestamp: 1701619673797, completed_scripts: [], from_version: '5.15.1', to_version: '5.15.2' } ] }
  }, 
'hostname2': {
    current_version: '5.15.2',
    upgrade_history: { successful_upgrades: [ { timestamp: 1701619673797, completed_scripts: [], from_version: '5.15.1', to_version: '5.15.2' } ] }
  }
}

2. Added a small redirect fix

Issues: Fixed #xxx / Gap #xxx

1. TODO: we need to handle concurrent upgrades of multiple hosts.

Testing Instructions:

• Doc added/updated
• Tests added

[tangledbytes]

I think we also need to probably document that in a cluster each host should have a unique name.

[romayalon]

@tangledbytes I added this limitation in docs, thanks!