Match allowed datatypes to yumrepo skip_if_unavailable support

In PR puppetlabs#663 an overly strict datatype was set for the
skip_if_unavailable parameter. The yumrepo type supports
a variety of string values and boolean values.

Author: seanmil

manifests/init.pp

@@ -82,7 +82,7 @@
 #   file locks cause unncessary service restarts.  By setting to true, the module
 #   will move files prior to installation that are known to cause file locks.
 # @param wait_for_pxp_agent_exit
-#   This parameter is only applicable for Windows operating systems and pertains to the 
+#   This parameter is only applicable for Windows operating systems and pertains to the
 #   /files/install_agent.ps1 script. This parameterizes the module to define the wait time
 #   for the PXP agent to end successfully. The default value is set 2 minutes.
 # @param wait_for_puppet_run
@@ -101,6 +101,7 @@
 # @param version_file_path
 #    The default install path for the VERSION file
 # @param skip_if_unavailable
+#    For yum-based repositories, set the skip_if_unavailable option of the `yumrepo` type.
 # @param disable_proxy
 class puppet_agent (
   String                         $arch                    = $facts['os']['architecture'],
@@ -125,7 +126,7 @@
   Boolean                        $disable_proxy           = false,
   Optional                       $proxy                   = undef,
   Array                          $install_options         = [],
-  String                         $skip_if_unavailable     = 'absent',
+  Variant[Boolean, String]       $skip_if_unavailable     = 'absent',
   Boolean                        $msi_move_locked_files   = false,
   Optional                       $wait_for_pxp_agent_exit = undef,
   Optional                       $wait_for_puppet_run     = undef,