Add fix for posting nodes with xPath with '/'

	- YangUtils method changed from using REGEX to cps path parser
	- unit test added for cps path util

Issue-ID: CPS-1433
Signed-off-by: emaclee <lee.anjella.macabuhay@est.tech>
Change-Id: Ibb9efdd09423f9bade4a4a557d7d9ed49aa44ef4
diff --git a/csit/tests/cps-data/cps-data.robot b/csit/tests/cps-data/cps-data.robot
index 2da2b73..096bd07 100644
--- a/csit/tests/cps-data/cps-data.robot
+++ b/csit/tests/cps-data/cps-data.robot
@@ -44,10 +44,10 @@
 
 Get Data Node by XPath
     ${uri}=             Set Variable        ${basePath}/v1/dataspaces/${dataspaceName}/anchors/${anchorName}/node
-    ${params}=          Create Dictionary   xpath=/test-tree/branch[@name='Left']/nest
+    ${params}=          Create Dictionary   xpath=/test-tree/branch[@name='LEFT/left']/nest
     ${headers}=         Create Dictionary   Authorization=${auth}
     ${response}=        Get On Session      CPS_URL   ${uri}   params=${params}   headers=${headers}   expected_status=200
     ${responseJson}=    Set Variable        ${response.json()['tree:nest']}
-    Should Be Equal As Strings              ${responseJson['name']}   Small
+    Should Be Equal As Strings              ${responseJson['name']}   SMALL/small