Improve the regex that handles absolute paths.

This should not choke on small directory names, like "pg".

Thanks to @elyscape for pointing out a better way of doing this.

lib/puppet/type/mountpoint.rb

@@ -37,7 +37,7 @@
     validate do |value|
       raise Puppet::Error, "name is not allowed to contain whitespace" if value =~ /\s/
       raise Puppet::Error, "name is not allowed to have trailing slashes" if value =~ %r{/$}
-      raise Puppet::Error, "name must be an absolute path" if value =~ %r{^[^/]} or value =~ %r{/../}
+      raise Puppet::Error, "name must be an absolute path" if value =~ %r{^[^/]} or value =~ %r{/\.\./}      
     end
   end