update allowed value of cisco privilege escalation

[nkoleske]

Description

This change renames the allowed values for Tenable.sc Credential's privilege escalation from "cisco" to "Cisco 'enable'".

Fixes #618

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] This change requires a documentation update

How Has This Been Tested?

1. Establish an authenticated Tenable.sc session
2. Create a credential entry
3. sc.credentials.edit("1000001", privilege_escalation="Cisco 'enable'")

Test Configuration:

• Python Version(s) Tested: 3.7.9
• Tenable.sc version 5.19

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[nkoleske]

I am not familiar with pytest. If you can recommend what type of test you are looking for and an example to reference I could try to write one. I took a look at tests/sc/test_credentials.py and didnt see anything that looked similar.

[SteveMcGrath]

This does seem to line up with the actual SC API.

[aseemsavio]

Hey @nkoleske! pyTenable majorly uses pytest and pytest-vcr. Looking these libraries up would be beneficial. pyTenable/tests/io/conftest.py houses the test fixtures. You can refer to the files inside pyTenable/tests/io/* directory with a test_ prefix as your examples for tests. Thanks.

[inayathulla]

Changed will be merged in PR -> https://github.com/tenable/pyTenable/pull/639