This commit adds an explicit mention of where to get assistance with the
module. This commit also adds a link to the PE documentation as it now
features the three reference architectures.

Add explicit help instructions to README

Prior to this commit, the `peadm::download` task would exit with
"success" when S3 returned a "404 Not Found" error page. This
would happen when a PE version was reqeusts that did not support
the OS platforms being provisioned. E.g. requesting an install of
PE 2018.1 on RedHat 8. The provisioning plan would then blow
later when `tar` found an XML document instead of a gzipped archive.

This commit updates the download task to:

  - Print the URL being downloaded to stderr.

  - Pass the `-f` flag to `curl` when downloading tarballs.
    This causes curl to exit with a status of 22 if the
    HTTP response is an error.

Improve error handling of peadm::download task

made print() call Py3 compliant, added checks for Py execs

This reverts commit ad6ae24.

Revert "made print() call Py3 compliant, added checks for Py execs"

This commit re-implements ad6ae24, but without a discovered behavior
change, where the task would exit with code 1 if the target file to read
did not exist.

The expected and original behavior is that if the file does not exist,
the content key is set to null and the error key is set to a string
value, but the task return code is still 0.

Re-implement ad6ae24 without behavior change

This commit adds a new download_mode parameter to the peadm::provision
and peadm::upgrade plans. The default value for the parameter is
bolthost, which causes PE installation content to be downloaded to the
stagingdir of the workstation running bolt and then uploaded to the
PE hosts. Setting download_mode to direct causes PE installation content
to be downloaded directly to the PE hosts. The direct mode skips uploads,
which offers a significant speed boost when the PE hosts have a route to
the internet and the bolt host is connected by a slow link, such as VPN.

Tag 1.1.0 is in this commit. Somehow it wasn't in the master branch.

  * When running puppetdb queries in the container it is helpful to
    have the the config file setup already. This commit configures
    the puppetdb.conf file on the puppet servers.

  * The docker container for bolt was having some encoding issues
    after running a plan.  This fixes that issue so the plan/command
    does not fail.

  * Only applies to the example docker containers

  * This only applies to our example docker containers.
    If the docker host reboots, the containers will now
    restart upon reboot. Was just too annoying before to always
    have to start up the machines again.

  * previously if a puppet 5 agent had already submitted a CSR
    the submit_csr task would fail.  This fixes that by checking
    if the host making the request has a cert already.

    Note this does not verify the cert is actually valid but only if the
    cert exists or not.  In puppet 6 we use ssl verify to do actual
    verification.

  * Specifies how to start a container so it can use the PE stack.

Docker updates

Add direct download option for PE installers

Rely on the Puppet agent run and puppet_enterprise module to apply the
correct permissions when it runs

Needs parenthesis around the `print()` function arguments.

Provide indication that the 1.x releases of peadm can only install up to
PE 2019.5.