NXOS_SSH/IOS XE IPv6 Regex update

[ubaumann]

• The regex did not match for IPv6 addresses ending or starting with :: (IOS XE and NXOS_SSH)
• On NXOS, the show bgp all summary vrf all with IPv6 addresses and long AS numbers has two newlines.

[ubaumann]

I tested the long AS number with IPv4 and the same problem occurs. Therefore and for readability I have changed the code to make two re.sub

[ktbyers]

@ubaumann Are there tests for the long as-number case?

[ubaumann]

@ktbyers The long as-number is combined with the IPv6 test case

2001:db8:e0:df::
                4    12345678
                         327465  327268      145    0    0     3w1d 4

https://github.com/napalm-automation/napalm/pull/2016/files#diff-cea37f4186bd9fbcbb95c704fda5ea3b17ecad55d1d50ee605d55aab70ef84fbR29

I did not write test for IPv4 with long AS number but because the two re.sub the case with ipv4 and ipv6 is the same.
I also did not write tests in the IOS XE for the IPv6 addresses ending or starting with ::

Should I add some more testing?

[ktbyers]

That is probably fine...I missed the long-number AS earlier in the test output.