Merge bug24911

Merged bug24809 into default

Merged bug24794 into default

Updated changelogs for 2.7.1

Updated changelogs by release build

Changelog changes for 2.6.1

Added tag rabbitmq_v2.6.0 for changeset 6547461e6c2e

Changelogs for 2.6.0 release

Changelogs for 2.6.0 release

Backport 1df8606372dd (add dependency from internal exchanges to trac…

…e exchange - bug 24208).