Fix checkstyle warnings in netconf-api

Change-Id: I174ea168e5b264cd99c2faa9ab182859806ef12f
Signed-off-by: Marian Dubai <mdubai@cisco.com>
Fix checkstyle warnings for config-persister-impl

Change-Id: Ife66b5fea7bb6d1fe293d6181d6da7221e296731
Signed-off-by: Marian Dubai <mdubai@cisco.com>
Merge changes Ife66b5fe,I174ea168

* changes:
  Fix checkstyle warnings for config-persister-impl
  Fix checkstyle warnings in netconf-api