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Added AWS_EB_PROFILE environment variable to the AWS Plugin. The EB CLI uses this
variable instead of the primary AWS_PROFILE variable to keep track of what profile
it is using.

https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/eb-cli3-configuration.html

* Update the AWS plugin to support disabling RPROMT display:
  Use a $SHOW_AWS_PROMPT option.

* Refactoring aws plugin:
  Exposing customizable aws_prompt_info function to be used in themes.

* Set aws prompt prefix and suffix to original values and fix README
Co-authored-by: "Vassilis S. Moustakas" <vsmoustakas@gmail.com>

* Clean up Homebrew detection and add comments. Also changed some if flags.
* Detect aws cli completion file from RPM

Stop exporting AWS_HOME and use the standard AWS_CONFIG_FILE environment
variable, with a fallback to ~/.aws/config (default location) if not
defined.

Close #7356

The environment variable name used to be AWS_DEFAULT_PROFILE but the
CLI documentation now only mentions AWS_PROFILE.

https://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html

It seems like the CLI was the only tool using AWS_DEFAULT_PROFILE, and
all the AWS SDKs used AWS_PROFILE, so they standardized on it.

https://onetechnical.wordpress.com/2016/10/07/the-curious-case-of-aws_default_profile/

Note: still left AWS_DEFAULT_PROFILE on the method to set the profile to
maintain backwards compatibility.

Close #7354

* speed up chruby plugin by eliminating(as much as possible) calls to brew

* speed up aws plugin by eliminating(as much as possible) calls to brew

Sometimes the output of ``homebrew --prefix`` and ``homebrew --prefix
awscli`` don't match, and the second is the correct call.

Check _aws_zsh_completer_path had exist or not

the mangled version installed into $(brew-prefix)/bin if using
homebrew installed awscli on OSX.

This was discussed here - https://github.com/Homebrew/homebrew/issues/30268

It also supports quickly switching AWS profiles defined in
~/.aws/config using the asp alias