
This patch refactors package installations in storlets devstack plugin, so that we can run storlets agents with the same python version as the one we have in host to run storlets middleware. This patch also bumps up openjdk version from 8 to 11, and python3 version from 3.5 to 3.6, so that we use the latest versin provided in distro. Change-Id: I6cb87976ff4fa6caaa58cf555685f24d95f214a8