Fix java installation step for Travis build

[eparovyshnaya]

Guys, we have our Travis builds failing on Installing oraclejdk8 step

Installing oraclejdk8
$ export JAVA_HOME=~/oraclejdk8
$ export PATH="$JAVA_HOME/bin:$PATH"
$ ~/bin/install-jdk.sh --target "/home/travis/oraclejdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "BCL"
Ignoring license option: BCL -- using GPLv2+CE by default
install-jdk.sh 2019-09-17
Expected feature release number in range of 9 to 14, but got: 8
The command "~/bin/install-jdk.sh --target "/home/travis/oraclejdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "BCL"" failed and exited with 3 during .
Your build has been stopped.

There are two possible fixes:

• use trsted storage to install the jvm from
• use openjdk8 instead, which is safe as we do not exploit seasoned enterprise libs here.

The first one is tried here as the easiest one (avoids documetnation issues and local installation issues). Let me know, if the second one is preferrable.

[eparovyshnaya]

Abandon in the favour of 318