[ee4j-build] Release scripts on new Jenkins

[Tomas Kraus <tomas.kraus@xxxxxxxxxx>]

I'm tryng to write release script on https://jenkins.eclipse.org and 
looks like it will require some changes.

Used docker images don't have /bin/bash so we have to work with /bin/sh 
which seems to be dumb Bourne Shell which does not support full bash 
arithmetic operations syntax.

I'm rewriting versions evaluation code to avoid using bash specific 
operators. Will attach it here when done.


Tomas