(maint) Fix exclude_list for puppet facts diff

This commit adds missing characters from the `EXCLUDE_LIST` array of
regular expressions used for filtering the `puppet facts diff` output of
volatile facts.

Author: luchihoratiu

lib/puppet/face/facts.rb

@@ -11,7 +11,7 @@
   memory\.swap\.available memory\.swap\.capacity memory\.swap\.used
   memory\.system\.available_bytes memory\.system\.used_bytes
   memory\.system\.available memory\.system\.capacity memory\.system\.used
-  mountpoints\..*\.available* mountpoints\..*\.capacity mountpoints\..*\.used*
+  mountpoints\..*\.available.* mountpoints\..*\.capacity mountpoints\..*\.used.*
   sp_uptime system_profiler\.uptime
   uptime uptime_days uptime_hours uptime_seconds
   system_uptime\.uptime system_uptime\.days system_uptime\.hours system_uptime\.seconds