Implement getDataNode(anchorName, xPath) in NF-Proxy

Added spring-boot-starter-validation instead of cps-ri.
Added test 'Data node without leaves and without children.' to MultipartFileUtilSpec groovy test
Created a method getNodeByCmHandleIdAndXpath(cmHandleId, cpsPath)
Added hardcoded value of NFS DataspaceName as: "NFP-Operation".
Issue-ID: CPS-172

Signed-off-by: Hanif Kukkalli <lte-ng@outlook.com>
Change-Id: Ie8086ede01a9c5069b1ee75864b04a0ee5e8a4f6
9 files changed