Standardize VRF Regex for IOSXE show_vrf.py

[mattchilders]

Currently ShowVrf doesn't match all valid special characters in VRF names, and uses different regexes for different commands throughout show_vrf.py. This change standardizes the regexes to all be the same and matches the special characters.

Description

This is a minor commit that standardizes the vrf regex in "show_vrf.py" so that they all use the [\S]+ rather than the mix of regexes that matched only certain special characters. This makes iosxe's show_vrf.py comparable with nxos's show_vrf.py.

Motivation and Context

IOS-XE parser didn't match VRF's with special characters.

Impact (If any)

None that I'm aware of

Screenshots:

Screenshot's of the relevant tests that had classes changed.
ShowVrf

ShowVrfDetail

ShowVRFIPv6

ShowPlatformSoftwareCefIpVrf

Checklist:

• [ x ] I have updated the changelog.
• I have updated the documentation (If applicable).
• [ x ] I have added tests to cover my changes (If applicable).
• [ x ] All new and existing tests passed.
• All new code passed compilation.

[ThomasJRyan]

Thank you for the contribution! I like the unit test you added. Never really considered having more generic tests like that