Fix frontend system_proxy_delete/system_proxy_set

OpenShift::Runtime::FrontendProxyServer#system_proxy_delete and
OpenShift::Runtime::FrontendProxyServer#system_proxy_set: Return values in
a consistent ordering (stdout, stderr, exit status) irrespective of whether
arguments were passed.

Previously, these methods returned the exit status as the first value
instead of the last if no arguments were provided.

Fix the corresponding test cases to expect the correct ordering.

This commit fixes bug 1121238.
Bug 1121067 - Updated error messages
Bug 1121864 - Cleanup OPENSHIFT_PRIMARY_CARTRIDGE_DIR
Merge pull request #5656 from jwhonce/bug/1121067

Merged by openshift-bot
Bug 1122657: Fixing logic to select gear for scaledown
race condition in haproxy reload

https://bugzilla.redhat.com/show_bug.cgi?id=1123054
Bug 1121459 - Update Origin release note link to release announce post
Automatic commit of package [openshift-origin-node-util] release [1.27.4-1].
Bubble up config suggestions compared to other the suggestions of the same level of importance
Merge pull request #5653 from abhgupta/abhgupta-dev

Merged by openshift-bot
Merge pull request #5659 from nhr/bug_1121459

Merged by openshift-bot
Bug 1123587 - Added OPENSHIFT_POSTGRESQL_LOCALE environment variable
Fix typo
Merge pull request #5657 from bparees/haproxy_race

Merged by openshift-bot
Merge pull request #5625 from Miciah/bug-1121238-fix-frontend-system_proxy_delete-and-system_proxy_set-methods-return-value-ordering

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Merge pull request #5660 from jwforres/bug_1064304_bubble_up_config_suggestions

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Merge pull request #5664 from mfojtik/postgresql

Merged by openshift-bot