Remove at hardcoding

[shenda1]

Description

PR is raised to remove nfsv3_rrcoe_only flag from network pool data source.

ISSUE TYPE

• Bugfix Pull Request

RESOURCE OR DATASOURCE NAME

powerscale_networkpool

# Checklist:

- [x] I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
- [x] I have verified that new and existing unit tests pass locally with my changes
- [x] I have not allowed coverage numbers to degenerate
- [x] I have maintained at least 80% code coverage
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have made corresponding changes to the documentation
- [x] I have added tests that prove my fix is effective or that my feature works
- [x] I have maintained backward compatibility


# How Has This Been Tested?
Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

- [x] Unit tests
- [x] Acceptance tests

[shenda1]

run e2e test NetworkPoolDataSource