Update qa/Dockerfile for openssh-client

jessie doesn't support `ssh-keygen -l -E` but stretch does: https://manpages.debian.org/jessie/openssh-client/ssh-keygen.1.en.html

Update qa/Dockerfile for openssh-client
jessie doesn't support `ssh-keygen -l -E` but stretch does: https://manpages.debian.org/jessie/openssh-client/ssh-keygen.1.en.html
94aa0b16 · Lin Jen-Shin · 1783a3d5 · 94aa0b16
Commit 94aa0b16 authored Mar 12, 2018 by Lin Jen-Shin
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--- a/qa/Dockerfile
+++ b/qa/Dockerfile
-FROM ruby:2.4
+FROM ruby:2.4-stretch
 LABEL maintainer "Grzegorz Bizon <grzegorz@gitlab.com>"
 ENV DEBIAN_FRONTEND noninteractive