fix bug 1067594 - document how to update ADI
Merge pull request #2374 from rhelmer/bug1067594-document-adi-update

fix bug 1067594 - document how to update ADI
fix bug 1069578 - link to debug login page from troubleshooting doc
Merge pull request #2379 from rhelmer/bug1069578-link-debug-login-from-troubleshooting

fix bug 1069578 - link to debug login page from troubleshooting doc
fix bug 1069718 - no longer need devtoolset SCL on RHEL/CentOS
Merge pull request #2384 from rhelmer/bug1069718-remove-devtoolset-scl

fix bug 1069718 - no longer need devtoolset SCL on RHEL/CentOS
fixes bug 804253 - remove settings.OPERATING_SYSTEMS
Merge pull request #2385 from peterbe/bug-804253-remove-settingsoperating_systems

fixes bug 804253 - remove settings.OPERATING_SYSTEMS
fix bug 1068422 - remove Mozilla servers from example configs