Update Dockerfile user to enable apt-get

Due to change in the base container
it is needed to replace the default user
before the apt-get commands in dockers
that are based on jetty:9.3-jre8

Change-Id: I675654c638d4e1bc81b1d1ae0509935aa5b1107e
Issue-Id: SDC-477
Signed-off-by: Areli Fuss <af732p@att.com>
2 files changed