Jenkins: Add jenkins-master image

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+Introduction
+------------
+
+This repository contains the dockerfiles used by Linaro CI.
+
+Contributing
+------------
+
+If you want to contribute changes, you can send Gerrit merge requests at
+https://review.trustedfirmware.org/#/q/project:ci/dockerfiles
+
+License
+-------
+
+The software is provided under a BSD-3-Clause.
+Contributions to this project are accepted under the same license with developer
+sign-off as described in the Contributing Guidelines above.