BUG-2017 Fix possible concurrent modification ex in config subsystem

Change-Id: I879118cee8967edf14e24e8af93945d95bbc9fbe
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
(cherry picked from commit 166f257203c1f2b5b77b0ac68441b7ced72a0b25)
BUG 2047 - HTTP GET - no returning error message

Error message was added to NormalizedNodeXmlBodyWriter.

Change-Id: I43914eaa62149b66303cef956f73e694fae9217f
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
(cherry picked from commit 4f2ea61562a35ae6ced742ef9f26722109551630)
Merge "BUG 2047 - HTTP GET - no returning error message" into stable/helium
Merge "BUG-2017 Fix possible concurrent modification ex in config subsystem" into stable/helium