Set $BMA_AWSCLI to specify which awscli to use
Set $BMA_AWSCLI to specify which awscli to use

Added while testing breaking changes in aws-cli-v2

Also useful for testing with
[localstack](https://github.com/localstack/localstack)

  e.g. `$ BMA_AWSCLI=awslocal stacks`

Also, print AWSCLI version when BMA_DEBUG=true

realestate-com-au/bash-my-aws,azrupani/bash-my-aws