Added memory additional memory stats and entropy available

Author: vuksanv

mem_stats/README.mkdn

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+mem_stats
+===============
+
+Python module for ganglia 3.1.
+
+This module allows you to collect memory metrics that have been left out of stock
+Ganglia gmond. For example I have it 
+
+Install
+===============
+
+Copy mem_stats.py from python_modules to your python modules directory e.g.
+
+/usr/lib64/ganglia/python_modules
+
+and mem_stats.pyconf to
+
+/etc/ganglia/conf.d/
+
+Restart Gmond and you should be set. If you would like additional memory stats collected
+look through mem_stats.py for the metric you want then add it to mem_stats.pyconf e.g.
+if you wanted to keep track of unevictable memory you would add
+
+  metric {
+    name = "mem_unevictable"
+    title = "Unevictable memory"
+    value_threshold = 1.0
+  }
+
+Restart Gmond and you are done.
+
+## AUTHOR
+
+Author: Vladimir Vuksan https://github.com/vvuksan

mem_stats/conf.d/mem_stats.pyconf

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+modules {
+  module {
+    name = "mem_stats"
+    language = "python"
+  }
+}
+
+collection_group {
+  collect_every = 30
+  time_threshold = 45
+  metric {
+    name = "mem_writeback"
+    title = "Mem actively being written to disk"
+    value_threshold = 1.0
+  }
+  metric {
+    name = "mem_dirty"
+    title = "Mem waiting to be written to disk"
+    value_threshold = 1.0
+  }
+
+}