feat: Added support for environments during registration

[jirihnidek]

• It is possible to specify environments during connecting (RHSM registration) using CLI option --environment
• It is possible to specify multiple environmets
• Added beforeCoonectAction checking combinations of CLI options

[jirihnidek]

To test this functionality it is necessary to create some testing environments. If you use local candlepin server, then you create new environments using following commands:

curl --stderr /dev/null --insecure --user admin:admin --request POST \
  --data '{"id": "env-id-1", "name": "env-name-1", "description": "Testing environment num. 1"}' \
  --header 'accept: application/json' --header 'content-type: application/json' \
  https://localhost:8443/candlepin/owners/donaldduck/environments

curl --stderr /dev/null --insecure --user admin:admin --request POST \
  --data '{"id": "env-id-2", "name": "env-name-2", "description": "Testing environment num. 2"}' \
  --header 'accept: application/json' --header 'content-type: application/json' \
  https://localhost:8443/candlepin/owners/donaldduck/environments

Then you can test connecting system using rhc using following command:

./rhc connect --username admin --password admin --organization donaldduck \
  --environment env-id-1 --environment env-id-2

As you can see, you can use CLI option --environment multiple times, because system could become member of more environments.

There is no command that could be used for getting list of valid environments, because there is no D-Bus API for getting such list. User just has to know IDs of environments.

It is also reason why rhc does not ask for environment (like subscription-manager), when no environment is provided using CLI option, but organization contains some environments. In that case system will be just registered, but system will not belong to any environment.

[jirihnidek]

/packit build

[jirihnidek]

Build started 10:40 ...
... most of build started 10:46 and finished during 1 minute.

It means that you have to wait 6 minutes in some queue.

[Lorquas]

The code looks good to me, concise and easy to follow. Thanks for the environment steps. I tested this against a rhel-9 machine and selinux denied rhc from accessing subscription-manager?

Outside of that the environments successfully connect, and the activation-key errors in the beforeConnectAction work as expected.

LGTM after a rebase.

[rehana-raj]

We agreed to delay merging of this PR until we confirm the requirements with depend teams.

[jirihnidek]

Closing this PR due to this: https://issues.redhat.com/browse/RHEL-53436 We can reopen later, when needed.