Fix OpenJDK in Docker Image

[arjenpdevries]

My students use SBT, and when SBT attempts to contact the jitpack.io servers (for warcutils) I get security errors: java.security.InvalidKeyException: EC parameters error.

You can find the fix (borrowed from the Travis team) in my instructions:
https://rubigdata.github.io/course/background/sbt.html

Basically:

apt-get install libbcprov-java
ln -s /usr/share/java/bcprov.jar /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/ext/bcprov.jar \
        && awk -F . -v OFS=. 'BEGIN{n=2}/^security\.provider/ {split($3, posAndEquals, "=");$3=n++"="posAndEquals[2];print;next} 1' \
             /etc/java-7-openjdk/security/java.security > /tmp/java.security \
        && echo "security.provider.1=org.bouncycastle.jce.provider.BouncyCastleProvider" >> /tmp/java.security \
        && mv /tmp/java.security /etc/java-7-openjdk/security/java.security

Would be great if that patch of the OpenJDK to use the BouncyCastle 🌴 🏰 security provider could already be applied in the Docker image.