provisioners/puppet: run from correct working directory [GH-1967]

CHANGELOG.md

@@ -69,6 +69,7 @@ BUG FIXES:
   - provisioners/ansible: Properly handle extra vars with spaces. [GH-1984]
   - provisioners/chef: Formatter option works properly. [GH-2058]
   - provisioners/puppet: mount synced folders as root to avoid weirdness
+  - provisioners/puppet: Run from the correct working directory. [GH-1967]
     with Puppet. [GH-2015]
   - providers/virtualbox: Use `getent` to get the group ID instead of
     `id` in case the name doesn't have a user. [GH-1801]

plugins/provisioners/puppet/provisioner/puppet.rb

@@ -99,6 +99,7 @@ module VagrantPlugins
             options << "--color=false"
           end
 
+          options << "--manifestdir #{manifests_guest_path}"
           options << "--detailed-exitcodes"
           options << @manifest_file
           options = options.join(" ")