Remove space on regex for command "show isis adjacency vrf"

[fmabille09]

BEFORE : p1 = re.compile(r'^IS-IS +[Pp]rocess: +(?P<process_id>\S+) +VRF: +(?P\S+)$')
AFTER : p1 = re.compile(r'^IS-IS +[Pp]rocess: +(?P<process_id>\S+) +VRF:+(?P\S+)$')

Remove the space after "VRF:" in the regex.

Description

Support issue link - #693

Motivation and Context

On some n9k, when launching command: "show isis adjacency vrf all", the output put a whitespace or not after VRF. So the output can be
"IS-IS process: process_id VRF: default" or "IS-IS process: process_id VRF:default"

But actually the parser only support a white space.

p1 = re.compile(r'^IS-IS +[Pp]rocess: +(?P<process_id>\S+) +VRF: +(?P\S+)$')"

Impact (If any)

Change regex on parser to support whitespace or not

Screenshots:

Checklist:

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

[sjpatel21]

Thanks for your contribution @fmabille09