Maint: Be more clear that puppet queue is deprecated

- Remove link to old wiki docs
- Link to PuppetDB docs
- Say "deprecated" again
Maint: (#18294) Update docs for ip property of Zone type (allows defrouters since 2.6)

Per Redmine 18294, the Zone type has allowed specifying default routers as part
of the IP string since at least 2.6 -- see Redmine 4296 for deets. This commit
updates the doc string to show how to do that.
Maint: Move pkgdmg documentation into provider description; document changed behavior

This wiki page was more longwinded than it needed to be; you can really sum it
up in about four bullet points. So I did that, and removed the wiki link.

Also, while investigating what the wiki said, it became clear that this provider
no longer actually uses open-uri: a Kernel.open call was changed to File.open,
but apparently nobody was using file:/// URLs (or anything weirder), so it went
unnoticed. So I added some comments for future maintainers of this code.
Maint: Remove remaining links to wiki pages in Puppet source

These pages now all have better-maintained counterparts in the main docs site.
Maint: Update docs for schedule type and metaparameter

The wording of these was out of date and somewhat strange.
Maint: Improve/reduce documentation of relationship metaparemeters

These descriptions were too wordy and too inconsistent. I'm imposing a format on
them so they all look alike, and a casual reader can tell how many there are and
how their behaviors differ. I'm also adding links to the more detailed
documentation.
Maint: Standardize docs for refresh behavior in resource types; clarify exec docs

Service/mount/exec already documented that they do the refresh thing, but it
wasn't organized in a predictable way. I'm imposing a convention of a bold
"Refresh" label, a reminder of where events come from, and a description of what
that type does when it gets one.

This commit also adds a lot more detail on how execs respond to refresh, since
it's actually really complicated and not the least bit intuitive. I also reworded
some of the older language near the top of the exec type, while I was in there.
Maint: Clarify docs for stage type and metaparameter

This was pretty disorganized and confusing. Now it's less so!
(#16570) Don't load the node object again in configurer

Avoid loading the node object again if we already have a catalog.
(pup-546) Remove hiera2 support from binder

This removes hiera2 support from binder.
Tests are updated to use ruby based bindings for the same data bindings
as the removed hiera2 based bindings.
(pup-546) Remove automatic injector lookup for class parameters.
(pup-546) Remove hiera2.rb (central file with require's for hiera2)
(pup-546) Update default.rb and remove mention of hiera2

The documentation for the --binder setting is updated to reflect
that hiera2-data-in-modules is no longer loaded, while still allowing
bindings to be made in ruby, now referred to as "bindings in modules".
(PUP-546) Replace lookup function with something useful

With removed hiera2, the lookup function is not as useful and is
now replaced with the lookup from (#22574) which first looks in
bound data and then in hiera.

The intent is to use the technolgy agnostic "lookup" in the future
parser/evaluator to enable shorthand notation. The actual lookup
mechanism/technology is thereby not visible to the user.
(PUP-546) Fix problems with lookup after removal of hiera2

Moved lookup functionality to separate helper class.
(maint) Provide option to 4x->3x convert to handle :undef differently

Functions requires :undef conversion to '', while other parts
require :undef (verbatim). This changes the signature of the convert
method to accept the value to use when :undef is encountered.
(PUP-798) Add call to watch_files to ensure reparsing

This adds a call to watch_file in the code path for the future
parser/evaluator at the same place such call is made in the 3x
implementation. 

The ParserFactory is given an environment, and when this is 
a real environment, its known_resource_types are given to the parser
adapter being created to allow it to make the call to watch_file.
Add vagrant testing guide to acceptance/README.

Point to the acceptance/README in the README_DEVELOPER, and also update
the README_DEVELOPER to refer to beaker rather than the now-deprecated
puppet-acceptance.
(PUP-1218) Add ssh-ed25519 support to the sshkey type
(PUP-1218) Teach the ssh_authorized_key provider about ssh-ed25519 too.