Handle context changes in Tramp kubernetes method

Handle context changes in Tramp kubernetes method

* doc/misc/tramp.texi (Inline methods): Remove note about cache reset.
(File name completion): Add tramp-completion-use-cache.

* etc/NEWS: Add 'tramp-completion-use-cache'.

* lisp/net/tramp-cache.el (tramp-completion-use-cache): New defcustom.
(tramp-parse-connection-properties): Use it.

* lisp/net/tramp-container.el (tramp-docker--completion-function)
(tramp-kubernetes--completion-function): Ensure the processes run
locally.
(tramp-kubernetes--current-context-data): New defun.
(tramp-methods) <kubernetes>: Add `tramp-config-check'.

* lisp/net/tramp-sh.el (tramp-open-connection-setup-interactive-shell):
Handle `tramp-login-args'.

* lisp/net/tramp.el (tramp-methods): Adapt docstring.