More aggressive sync timings & improve other stuff

test_read.sh

@@ -0,0 +1,13 @@
+
+#!/bin/bash
+
+for FILE in $(find target/debug/deps); do 
+	SHA2=$(curl localhost:3900/$FILE -H 'Host: garage' 2>/dev/null | sha256sum | cut -d ' ' -f 1)
+	SHA2REF=$(sha256sum $FILE | cut -d ' ' -f 1)
+	if [ "$SHA2" = "$SHA2REF" ]; then
+		echo "OK $FILE"
+	else
+		echo "!!!! ERROR $FILE !!!!"
+	fi
+done
+