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Fixes #17631 - Validate puppetrun and realm providers

This commit adds checks for the puppetrun/realms providers so that they
have to be compliant with a certain regex in order to be accepted as
parameters.

Fixes #16942 - Added param dhcp_pxeserver

Closes GH-312

Allow $dns_reverse to be a string or an array

Fixes #16705 - copy signed grubx64.efi from /boot (#311)

Change existing Kafo type definitions to Puppet 4 types

Supported since Kafo 1.0.0, it performs more precise validation of
parameter values and can later be moved to the parameter definitions
when the module is made Puppet 4-only.

refactor puppetssh_command default

closes GH-309

Add Archlinux support

Use puppetdir from params

Use a default if puppet_environmentpath fact n/a

closes GH-303

add smart_proxy_omaha plugin

closes GH-298