* connection/docker: add privilege escalation support (#55816)
As described in #53385 (and #31759), the docker connection driver did
not support privilege escalation. This commit is a shameless
cut-and-paste of the privilege escalation support from the `local`
connection plugin into the `docker` plugin.
Closes: #53385
(cherry picked from commit 61e476b908)
* docker connection plugin: make privilege escalation code more similar to local.py (#56288)
* Make more similar to local.py
* Fix typo.
(cherry picked from commit 708bda06aa)
