tt status: give more status information

[Totktonada]

tt status prints an instance in the green color in the following situations:

• config:info() reports startup_in_progress status, because a replicaset bootstrap process waits for a quorum of instances.
• config:info() reports errors after a reload.
• box.info reports the orphan status.
• All the instances are read-only due to a mistake in a login or a password in the replication configuration (box.info.replication reports errors) -- see also tt status: show RO/RW status #835.

I propose to print such instances in a yellow color and give all the collected warnings/errors.

I think that a preferred way to collect the status information is a control socket (console), but it is OK to use iproto as a backup way (for example, if the instance is on a remote machine).