Create lo abbreviation for localhost in commands

[dominikbraun]

buneary commands can become quite long, partially because the host - which mostly corresponds to localhost for local development - has to be specified in each command:

$ buneary create exchange localhost my-exchange topic

Introducing a lo abbreviation could shorten this a bit.

$ buneary create exchange lo my-exchange topic

Internally, it would be sufficient to check whether the address is "lo" and change it to "localhost" if it is.