Currently, we have a number of Eclipse URLs in jobs and they're inconsistently applied, plus are scattered across a lot of jobs / variations.

Instead, we should externalize these URLs as variables we can control from some other global properties file, perhaps located in https://github.com/jbosstools/jbosstools-build-ci/blob/master/util/ and called jbosstools-jenkins.properties. This would make the jobs easier to maintain and I'd forget to update stuff less often.

Affected jobs:

• devstudio_master/job/jbosstools-composite-install_master/config.xml
• devstudio_master/job/jbosstools-install-p2director.install-tests.matrix_master/config.xml
• devstudio_target_platforms/job/jbosstoolstargetplatform-4.70.x/config.xml
• devstudio_target_platforms/job/jbosstoolstargetplatform-4.71.x/config.xml
• devstudio_target_platforms/job/jbosstoolstargetplatform-4.71.x-experimental/config.xml
• devstudio_target_platforms/job/jbosstoolstargetplatformrequirements-mirror-matrix/config.xml
• jbosstools-releng/job/jbosstools-cleanup/config.xml
• ...?

URL patterns:

• /eclipse/downloads/drops4/R-4.7.1-201709061700/eclipse-platform-4.7.1-linux-gtk.tar.gz
• /eclipse/downloads/drops4/M-4.7.1RC4-201709061700/eclipse-platform-4.7.1RC4-linux-gtk.tar.gz
• /eclipse/downloads/drops4/S-4.7RC4a-201706120950/eclipse-platform-4.7RC4a-linux-gtk.tar.gz

• http://www.eclipse.org/downloads/download.php?r=1&file=/eclipse/downloads/drops4/S-4.7RC4a-201706120950/eclipse-platform-4.7RC4a-linux-gtk.tar.gz
• http://download.eclipse.org/eclipse/downloads/drops4/S-4.7RC4a-201706120950/download.php?dropFile=eclipse-platform-4.7RC4a-linux-gtk.tar.gz

• eclipse_downloads_drops4_R-4.7.1-201709061700_eclipse-platform-4.7.1-linux-gtk.tar.gz
• eclipse-platform-4.7.1-linux-gtk.tar.gz

• ... more?