Fail fast when access to registration service is forbidden

[mcalmer]

The use case:

A customer has only BYOS instances and a total isolated network where no access to a not company network is allowed.
Also no access to the cloud registration service is possible.

The customer manages the instances with SUSE Manager.
SUSE Manager is calling instance-flavor-check on all clients to find out if they are BYOS or PAYG.
This cause now delays and performance problems as the tool always need to reach a timeout before it can report BYOS.

Possible options to come around this:

• configuration option to disable this and directly return BYOS
• environment variable to achieve this
• reduce timeout or intelligent detection that the service cannot be reached.
• etc...

See also: https://bugzilla.suse.com/show_bug.cgi?id=1218305#c59 and also https://bugzilla.suse.com/show_bug.cgi?id=1222134

[jesusbv]

In order to mitigate the performance impact on the request timeout, a timeout of 10 seconds (as agreed) instead of letting the request timeout with its default (longer) value

To help with the users with no network, a new flag like --retry-attempts defaulting to 3 would help
so one could call the command with 0 and would have to wait 10 seconds (1 request) to get the value