Allow matchingRule and attrstyle in olcAccess

We had a requirement to use a diffent matchingRule for the Access Rule. This inported well but on the next run it did fail because it could not parse it. This fixes this

Author: cbergmann

lib/puppet/provider/openldap_access/olc.rb

@@ -30,7 +30,7 @@ def self.instances
           suffix = line.split[1]
         when %r{^olcAccess: }
           begin
-            position, what, bys = line.match(%r{^olcAccess:\s+\{(\d+)\}to\s+(\S+(?:\s+filter=\S+)?(?:\s+attrs=\S+)?(?:\s+val=\S+)?)(\s+by\s+.*)+$}).captures
+            position, what, bys = line.match(%r{^olcAccess:\s+\{(\d+)\}to\s+(\S+(?:\s+filter=\S+)?(?:\s+attrs=\S+)?(?:\s+val(?:/\S+)?(?:\.\S+)?=\S+)?)(\s+by\s+.*)+$}).captures
           rescue StandardError
             raise Puppet::Error, "Failed to parse olcAccess for suffix '#{suffix}': #{line}"
           end