Mergeback Release from 2.3.0

This commit adds the ability to set authenticationinfo to iis_site by
adding a new parameter to iis_site and relevant code to the iis_site
provider. Acceptance test for code is added as well

This commit also modifies self.prefetch to merge
`provider.authenticationinfo` and
`resources[site]['authenticationinfo']`. Both hashes have the correct
information,  but the one that comes from the user may have a subset of
all that can be specified. If we don't merge, then Puppet thinks there
was a change that needs to be corrected.

…ite-authentication

(MODULES-5229) Add authenticationinfo to iis_site

This change makes it possible to pass both the port number and the
hostname header value from the bindinginformation property to the
New-Website cmdlet when creating a new website.

…port_conflict_hostname_only

(MODULES-6637) Port Conflict Hostname Only

This change ensures that if a user sets the Ensure property of a
manifest to present that Puppet run will neither attempt to start the
site if it is stopped nor display a state transition message to the
terminal and the logs specifying a change from <state> to present.

…Ensure_Present_IIS_Site_loop

(MODULES-6673) Ensure Present IIS Site Loop

The module already supports passing the Sensitive datatype to password
parameters. This change adds tests to ensure that this functionality
is never accidently broken.

…sensitive_datatype

(MODULES-6208) Should support Sensitive datatype

This change brings the documentation in the type files into sync with
what was present in the README.md file. In some cases the text was
better in the type file and so the two sources were combined.

…udpate_documentation

(MODULES-5459) Update Documentation

This change clarifies some of the wording in the README.md document.

(MODULES-6848)- README.md edits

…-release-prep-4.3.1

(MODULES-6847) Prepare 4.3.1 release