INFRA-41; Migrate OracleJDK to OpenJDK installing in custom images

[mshaposhnik]

What does this PR do?

Migrate OracleJDK to OpenJDK installing in custom images

What issues does this PR fix or reference?

INFRA-41

Previous behavior

Oracle JDK was installed on agent images without Java

New behavior

OpenJDK is installed on agent images without Java

[mshaposhnik]

@skabashnyuk @tolusha pls review

[codenvy-ci]

Build success. https://ci.codenvycorp.com/job/che-pullrequests-build/1582/

[tolusha]

We also have to install java if existed java version is below 1.8

    java_version=$(${JAVA_HOME}/bin/java -version 2>&1 | sed 's/.* version "\\(.*\\)\\.\\(.*\\)\\..*"/\\1\\2/; 1q')		
    if [ "${java_version}" -lt "18" ]; then		
        downloadJava;		
    fi

[tolusha]

A lot of duplicated code fragments:

if [ ${INSTALL_JDK} = true ]; then
         export JAVA_HOME=${CHE_DIR}/jdk1.8
         ln -s /usr/lib/jvm/java-1.8.0-openjdk $JAVA_HOME
    fi

Can we simplify that?

[mshaposhnik]

@tolusha added version check and JAVA_HOME export. Link path can differ a bit, so leave it as-is per OS type.

[tolusha]

Agree.
You've changed only one script but all agents (json files) have been changed.
Could you pls revert them?

[mshaposhnik]

It's only license year.

[codenvy-ci]

Build success. https://ci.codenvycorp.com/job/che-pullrequests-build/1593/