ipn/store/aws: support using sub-paths in parameters

Fixes #3431

Signed-off-by: Thomas Weiß <[email protected]>

ipn/store/aws/store_aws.go

@@ -23,7 +23,7 @@ import (
 )
 
 const (
-	parameterNameRxStr = `^parameter/(.*)`
+	parameterNameRxStr = `^parameter(/.*)`
 )
 
 var parameterNameRx = regexp.MustCompile(parameterNameRxStr)