Fixes Docker installation of --vimemu installer.

Fixes two issues recently reported on OSM_TECH.
1. Docker permission issue.
2. Docker internet access issue. Solved by enforcing a
docker service restart.

Change-Id: Ic297bfa2db02eae676c03127c09f291f55b736fd
Signed-off-by: peusterm <manuel.peuster@uni-paderborn.de>