BUG-692 Fix major issues reported by sonar for netconf subsystem

Change-Id: I2f7cd479a773b7c3edc111c45add8ab5510fb47f
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
BUG-1521 netconf-util line coverage

Change-Id: I90fc67622d95fa1b1e06fcf3c10a4d0ea40000c4
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
Merge "BUG-692 Fix major issues reported by sonar for netconf subsystem"