Add --prefer-private-ip argument to the eb ssh command

[blampe]

Issue #3

Description of changes:

This is a quality of life improvement for anyone who'd like to run a split-tunnel VPN.

This preserves the existing behavior of the eb ssh command but exposes a --prefer-private-ip option that uses the instance's private IP before its public one.

I've included a unit test, and I've confirmed this works as expected in my environment.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[frank-parry]

Tested against my environment- works perfectly as described

[brandonburkett]

Did this change make it in? I would like to be able to eb ssh with private IP restrictions.

[yohanthshetty]

Did this change make it in? I would like to be able to eb ssh with private IP restrictions.

Hi @brandonburkett, Yes, the change has been merged to the master branch. Thank You.

[yohanthshetty]

Tested against my environment- works perfectly as described

Hi @frank-parry Can you please elaborate how you tested this
PR? Did you create the eb environment and ec2 instance in the same vpc? Or Did you set the inbound rules in the security group for that instance?

[alisson276]

It would be nice having this merged!