Fix qpid use for trove on RHEL/CentOS/Fedora

This patch fixes config samples that use rabbit instead of qpid in the
install guide for RHEL-like distributions.

Change-Id: Ibe06f5b473db4cfe906af9c1f471e7be86349d8a
Closes-Bug: #1319415
backport: icehouse
Merge "Fix qpid use for trove on RHEL/CentOS/Fedora"