Set kombu reconnect delay to 5 seconds

depends on https://gerrit.mirantis.com/#/c/16137/
but can be safely merged (the option will be ignored)


Change-Id: I0ad9bcfd1f35e5d557a147a2cb0d3b2f2d79c846
Partial-Bug: #1322259
(cherry picked from commit 1fd0732e53b4805c18dbca693ab31914a6a73c47)
Merge "Set kombu reconnect delay to 5 seconds" into stable/4.1