Integration tests are not able to download eclipse

There is a configuration file [1] which contains URL to latest Eclipse. Since 4.5.3.AM2 there is absolute path in eclipseJeeURL, but my test are able to work only with relative path. I have to adapt them.

[1] https://raw.githubusercontent.com/jbosstools/jbosstools-build-ci/master/util/jbosstools-jenkins.properties

Next problem is that script getAndInstallEclipse.groovy is not albe to download eclipse from [2] (maybe because of HTTPS?)

[2] https://ci.eclipse.org/packaging/job/oxygen.epp-tycho-build/455/artifact/org.eclipse.epp.packages/archive/20180222-1826_eclipse-jee-oxygen-3-rc2-linux.gtk.x86_64.tar.gz

Affected jobs:
https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Devstudio/view/devstudio_installer_tests/job/Devstudio_Installation/job/BYOE_Installation/job/Install_JBDS_from_installer_jar/
https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Devstudio/view/devstudio_installer_tests/job/Devstudio_Installation/job/BYOE_Installation/job/Install_JBDS_online_update_site/
https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Devstudio/view/devstudio_installer_tests/job/Devstudio_Installation/job/BYOE_Installation/job/Install_JBDS_update_core_zip/
https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Devstudio/view/devstudio_installer_tests/job/Devstudio_Installation/job/BYOE_Installation/job/Install_JBoss_Tools_online_update_site/
https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/Devstudio/view/devstudio_installer_tests/job/Devstudio_Installation/job/Post_install_tests/job/Install_sw_from_central_JBossTools/