Validator log filter may now be reconfigured at runtime (#5473)

* Log filter may now be reconfigured at runtime

* Add RPC API and bash script to reconfigure the log filter

scripts/set-log-filter.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+#
+# Reconfigures the log filter on a validator using the current RUST_LOG value
+#
+
+if [[ -n $1 ]]; then
+  url=$1
+else
+  # Default to the local node
+  url=http://127.0.0.1:8899
+fi
+
+if [[ -z $RUST_LOG ]]; then
+  echo "RUST_LOG not defined"
+  exit 1
+fi
+
+set -x
+exec curl $url -X POST -H "Content-Type: application/json" \
+  -d "
+    {
+      \"jsonrpc\": \"2.0\",
+      \"id\": 1,
+      \"method\": \"setLogFilter\",
+      \"params\": [\"$RUST_LOG\"]
+    }
+  "