This week in parliament, Judith Collins said goodbye, Shane Jones had a showdown and MPs were reminded they’re all capable of immigration dog whistles. Tuesday began a three-week sitting block, but was also the end of the road for one MP. With a curtsy and a Cheshire grin, minister Judith Collins bid tōfā to parliament this week after 24 years as a National Party MP. Her valedictory speech on Tuesday evening inspired plenty of applause, a few te…