(MAINT) Add --debug option to `apply_manifest_on` helper

Before every 'puppet apply' command is executed with --verbose.
Now you can pass `debug: true`, which executes 'puppet apply' with the
--debug flag.
QENG-1075 Auto expand cygpath when performing scp_to

Modified to have match anything on the to_path `cygpath

Added yard docs to expanding new behavior with cygpath
(maint) Don't fail if master node is already in console
(QENG-1257) do_scp_to raises IOError if file doesn't exist

Before, if the file doesn't exist, you would get a Result object back that had a nil exit_code.  Talking with some people, we decided that if you get a Result object back, it implies that the command was run, which doesn't happen here.  Now we raise an error, which is more indicative of an error in beaker setup, which is what's actually going on here.
(QENG-1257) updated yard doc for do_scp_to to make parameters consistently formatted
(MAINT) Add metadata.json as part of determining module root
(MAINT) improve Modulefile/metadata.json logging msg
(MAINT) fix spec stubs for Modulefile/metadata.json detection
(gh-469) Adding a new wrapper for the powershell.exe command

There are several places in the codebase where this will be used as
powershell is the most common scipting environment on windows.

The aim of this new addtion is to wrap a few of the complexities of
executing powershell commands, such as discovering the powershell.exe
location and passing the correct command line paramaters.
Merge pull request #382 from justinstoller/metadataJsonSupport

Metadata json support
Merge pull request #493 from kevpl/qeng1257_scpto_addioerror

QENG-1257 scp_to Added IOError
Bump aws-sdk to v1.57.0 for eu-central-1 support

Prior to this commit, we pinned aws-sdk to v1.42.0. Today, AWS brought
the eu-central-1 datacenter online. When Beaker attempts to run its
zombie killer script(s), the AWS SDK doesn't know how to handle this
datacenter. To combat the issue, AWS released v1.57.0 of the aws-sdk gem
today to coincide with this datacenter being brought online.

This commit modifies Beaker's Gemspec to use aws-sdk v1.57.0 so that it
can properly use the eu-central-1 datacenter.
(QENG-1414) Allow installation of OSX using simplified agent

OSX has been a supported simplified platform since its release, but
beaker did not support this deployment pattern. This change makes it
work.

Conflicts:
	lib/beaker/dsl/install_utils.rb
Merge pull request #506 from puppetlabs/aws-sdk-bump

Bump aws-sdk to v1.57.0 for eu-central-1 support
Merge pull request #507 from branan/osx_simplified_support

(QENG-1414) Allow installation of OSX using simplified agent
(MAINT) removed yard param notation where no parameter was given
Merge pull request #511 from kevpl/yard_quickfix

(MAINT) removed yard param notation where no parameter was given
Merge pull request #494 from branan/skip_on_existing_node

(maint) Don't fail if master node is already in console
Merge pull request #401 from cyberious/ScpAutoExpand

QENG-1075 Auto expand cygpath when performing scp_to on windows
Merge pull request #460 from liamjbennett/powershell_wrapper

Adding a new powershell wrapper