Add upgrade/version handling for splunkforwarder

- Change "ensure" to an explicit version (otherwise only the file in /opt/staging will be added when $version is bumped)
- Extra handling of accepting the license
- Limit `ensure => version` to RedHat, the 'dpkg' provider is not versionable, so only specify version on osfamily RedHat.

`ensure => absent` for the ftr file might even completely replace `Exec['license_splunkforwarder']` eventually (untested, however)

manifests/forwarder.pp

@@ -174,6 +174,15 @@
     }
   }
 
+  # To make sure upgrades also don't ask for licensing
+  # Cannot run before license_splunkforwarder (or that will fail)
+  # Cannot run before the service is started (or that will complain about license)
+  file { "${forwarder_dir}/ftr" :
+    ensure  => absent,
+    require => Exec['license_splunkforwarder'],
+    before  => Service[$virtual_service],
+  }
+
   file { "${forwarder_confdir}/system/local/deploymentclient.conf":
     ensure => file,
     tag    => 'splunk_forwarder',

manifests/params.pp

@@ -252,7 +252,14 @@
   $forwarder_pkg_src = "${src_root}/products/universalforwarder/releases/${version}/${forwarder_src_subdir}/${forwarder_src_pkg}"
   $create_password   = true
 
-  $forwarder_pkg_ensure = 'installed'
+  case $osfamily {
+    'RedHat': {
+      $forwarder_pkg_ensure = $version
+    }
+    default: {
+      $forwarder_pkg_ensure = 'installed'
+    }
+  }
 
   # A meta resource so providers know where splunk is installed:
   splunk_config { 'splunk':