Enable Anon memory alarming

The starlingX collectd memory monitoring plugin is no longer
alarming Anon memory overage due to this previous commit.

https://opendev.org/
starlingx/monitoring/commit/fcc8ddda66b507e747a6e5f32c2300b84e4f7ad6

The Anon (Anonymous) memory 'val.type' dispatched also needs
to be changed from 'percent' to 'memory' like the platform
memory was in that commit so that the reading notification
is sent to the fm_notifier which manages alarm and degrade.

Test Plan: for both total and numa nodes

PASS: Verify Anon memory major alarming and clear
PASS: Verify Anon memory critical alarming, degrade and clear
PASS: Verify Anon memory alarms/degrade clear over collectd restart
PASS: Verify Anon memory degrade handling over multiple alarm
      severity threshold assertion/clear changes across different
      eids. Test for stuck degrade case.

Closes-Bug: 2000251
Signed-off-by: Eric MacDonald <eric.macdonald@windriver.com>
Change-Id: I7c436a64886ecb619d2db751a1f92f2ffb1c4e9b

collectd-extensions/src/memory.py

@@ -875,7 +875,7 @@ def read_func():
     val.dispatch(values=[obj.normal['total_MiB']])
 
     val = collectd.Values(host=obj.hostname)
-    val.type = 'percent'
+    val.type = 'memory'
     val.type_instance = 'used'
     val.plugin = 'memory'
     val.plugin_instance = 'total'
@@ -884,7 +884,7 @@ def read_func():
     # Dispatch per-numa normal memory usage values derived from meminfo
     for node in sorted(obj.normal_nodes.keys()):
         val = collectd.Values(host=obj.hostname)
-        val.type = 'percent'
+        val.type = 'memory'
         val.type_instance = 'used'
         val.plugin = 'memory'
         val.plugin_instance = node