[Issue-Id:RIC-150] Enhancement to it/test repo

[Issue-Id:RIC-150] Enhancement to it/test repo

As per review comments from Dave, Addressed the review comment.
Fixed variables descriptive ${aaa}
Oran build issue fixed by setting ENV
"CRYPTOGRAPHY_DONT_BUILD_RUST=1"
Fixed deployment name and namespace in global properties and ete
testsuite
Addressed review comments from Dave - Fixed XappNS variable by replacing
the hardcode ricxapp in global_properties.

subtasks:
RIC-740, Verify E2 setup and response using rest API
RIC-741 Verify Subcription flow using nanobot
RIC-742 Verify Indication flow using nanobot
RIC-750 it-test repo: Missing space in template folder

       Added E2mgr API to validate the E2setup request response in to ete.robot
       Added Kubectl client API function to validate subscription and indication in to ete.robot
       Added new field plmnid and gnb id in values.yaml file to add up gnbs
       Added global variabled for gnbs in global_properties.robot
       Updated README file wrt recent modification
       Fixed one space issue in template folder/job-ric-robot-run.yaml

Signed-off-by: Sangeetha KR <sangeetha-kr@hcl.com>
Change-Id: I9d0b242b0b549b989e9e005cbb8405d34e3ce62d