Better visiblity in ui when device config not present

[gstorme]

Hi,

When a user is disabled or his device gets deleted, the client looses connectivity, as expected.
However from a client UI perspective, this is not really clear.
In the defguard client under locations, the state remains connected/active with a green status symbol.

In settings/log these entries are present: internal error: device config not present in response
Only after 5 minutes a popup appears with the message
The Location XXX has been disconnected, since we have detected that the server is not responding with any traffic for 300s. If this message keeps occurring, please contact your administrator and inform them about this fact.

Is it possible to indicate this more clearly (upon connection) to the client, that the connection cannot be established?

[kchudy]

Possible scenarios:

• user gets disabled -> display explicit message saying "You are not authorised to access this instance."; instance stays in the app
• user gets deleted -> display explicit message saying "You are not authorised to access this instance."; instance disappears from the app
• user loses access to location -> display system alert and display a message bar in the app saying "You lost access to location xyz"
• device gets deleted -> same as user gets deleted

[kchudy]

Use same components as in #353