If the RABBITMQADMIN_NON_INTERACTIVE_MODE is not set to true, this tool

now can infer subcommand and --long-option names.

This means that a subcommand can be referenced with its unique prefix,
that is,

* 'del queue' will be inferred as 'delete queue'
* 'del q --nam "a.queue"' will be inferred as 'delete queue --name "a.queue"'

To enable each feature, set the following environment variables to
'true':

* `RABBITMQADMIN_INFER_SUBCOMMANDS`
* `RABBITMQADMIN_INFER_LONG_OPTIONS`

This feature is only mean to be used interactively. For non-interactive
use, it can be potentially dangerous and therefore requires
an explicit opt-in from the user.

Author: michaelklishin