Change the activation procedure for connections that require secrets
in the following way:
- nmcli creates a secret-agent and leaves it disabled so that
incoming requests are queued
- nmcli calls ActivateConnection()
- when the method returns success, the secret-agent gets enabled and
all queued requests are processed
When the user activates a connection which is already auto-activating,
NM will deactivate the current active-connection and will call
CancelGetSecrets() for it before the new ActivateConnection()
returns. In this way, when the secret-agent is enabled by nmcli, we
have the guarantee that there aren't any queued requests for
the deactivating connections.
https://bugzilla.redhat.com/show_bug.cgi?id=1438476
61b666902b