fix: example bgp with v6 and cleanup

[tobikris]

The second IPv6 was missing the VRF line and the example was not working therefore. I tried to simplify and streamline the example a little bit. This also removes the need for build tags to differentiate between IPv4 and IPv6.

[codecov-commenter]

Codecov Report

Merging #393 (a8d4734) into master (15324ad) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #393   +/-   ##
=======================================
  Coverage   55.14%   55.14%           
=======================================
  Files         147      147           
  Lines        7672     7672           
=======================================
  Hits         4231     4231           
  Misses       3245     3245           
  Partials      196      196           

Flag	Coverage Δ
unittests	55.14% <ø> (ø)

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