Fix KubectlTransport::addChdir()

[ceesgeene]

Overview

This pull request:

Q	A
Bug fix?	yes
New feature?	yes
Has tests?	yes
BC breaks?	no
Deprecations?	no

Summary

Kubectl does not support "shell scripting"; simple prepending cd before the command to be executed won´t work. Kubectl also does not provide an option to set the working dir (like docker).

This PR wraps the command to be executed in a subshell while delaying the prepending of the cd to the very last (moved to ::wrap()).

To prevent wrapping all calls in a subshell/cd this PR also introduces a new option kubectl.cd_root. When set to false, and the requested cd matches the site alias root, the command is not wrapped in the subshell and no cd call is added.

Description

Any additional information.