Release v1.6.0 on 2021-11-16.

1. 72b9088 vty: introduce the expert mode and a command to enable it by Vadim Yanitskiy · 3 years, 8 months ago
2. 9a28d3c tests/vty: verify 'show vty-attributes' / 'list' commands by Vadim Yanitskiy · 3 years, 9 months ago
3. 14aadd5 vty: tests: Verify incomplete optional parameters are passed to vty funcs by Pau Espin Pedrol · 5 years ago
4. b55f4d2 vty: enable optional-multi-choice syntax: [(one|two)] by Neels Hofmeyr · 5 years ago
5. faa49e2 add generic vty_transcript_test.c, vty_transcript_test.vty by Neels Hofmeyr · 5 years ago