Update submodules

This brings in:

- NETCONF stack updates from cla-sysrep
- rebased Netopeer2 stack from our Buildroot modifications

We still need pylibfdt because of uboot (not uboot-tools) package.

Change-Id: I62b967c3fe7280b2cc500e301e492fb35c06d398
diff --git a/submodules/buildroot b/submodules/buildroot
index abe61d0..d49da9f 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit abe61d07e924200fac56c993f3f15a5ebcc5d96e
+Subproject commit d49da9ff17dda1d75a9dae61d7d259c9158fe13c
diff --git a/submodules/cla-sysrepo b/submodules/cla-sysrepo
index 2c97fdc..7d27ac7 160000
--- a/submodules/cla-sysrepo
+++ b/submodules/cla-sysrepo
@@ -1 +1 @@
-Subproject commit 2c97fdcabcd5d56fff79c7b7cf513ed84912fc50
+Subproject commit 7d27ac760875bf81245963f134f17bd39dfa3e1b