Improve UI for v1 auth create CLI command

[stuartcarnie]

What

The influx v1 auth create command requires the following improvements:

• rename --auth-token argument to --username to be clear its purpose from a v1 perspective
• prompt for token password by default and ensure the password is set
• add --no-password to skip password prompt

Why

The existing implementation of the influx v1 auth create command allows a user to create an auth token, but does not set a password until the user executes the influx v1 auth set-password command. Without a password, the token is unusable, returning an unauthorised error. It is unclear from the API that this is because the password is not set.