Netopeer2-{server,keystored} patches and key maangement

Change-Id: I7359403c440b8593328d1e8727c45be8e7264d9b
diff --git a/submodules/buildroot b/submodules/buildroot
index 9e9957a..d17c750 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit 9e9957aada97722f821174a0ff7b31db5a774438
+Subproject commit d17c7501254d3ace75ff7c4124d0f3e7eb87c555