Update pfcp-agent value and add explanations to configs

Also remove 'measure' field, which is not used in P4-UPF

Change-Id: I1fb16c81ccf65eab05f34c956518c06e87294534
diff --git a/pfcp-agent/Chart.yaml b/pfcp-agent/Chart.yaml
index 315ab21..23f0c01 100644
--- a/pfcp-agent/Chart.yaml
+++ b/pfcp-agent/Chart.yaml
@@ -5,4 +5,4 @@
 apiVersion: v1
 description: PFCP Agent for SD-Fabric's P4 UPF
 name: pfcp-agent
-version: 0.0.11
+version: 0.0.12