Update to 2.3.6 on euwe. 😅

We previously tried to upgrade to 2.3.6 on euwe by backporting:
ManageIQ#15993

This was causing a hang in the automation test suite on euwe and we
reverted it in:
ManageIQ#16087

https://bugzilla.redhat.com/show_bug.cgi?id=1560578

The prior 2 commits contain a manual backport of
ManageIQ#14239
which solves the 100% cpu hang of the automate ruby method with ruby 2.3.2+.

.travis.yml

@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-- '2.3.1'
+- '2.3.6'
 sudo: false
 cache:
   bundler: true