When using a subshell, add some help messages to minimise confusion and improve DX #1136
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aws-vault has traditionally stuck to the unix philosophy of "silence is golden". However there are a number of scenarios which consistently confuse users.
SHELL
and creates a subshell when a command isn't provided--ec2-server
AWS_CONTAINER_CREDENTIALS_FULL_URI
when using--ecs-server
For that reason, this PR changes aws-vault to provide minimalistic feedback to the user when these scenarios come up.