Renames TaskStatus.queue to TaskStatus.worker_name
Fixes tests for TaskStatus, TaskStatusManager worker_name default
Updates docs and release notes for API change. Small test fixes.
Docs updates for the 2.5.1 upgrade
Adds 'queue' attribute to TaskReport to preserve API compatability
Small docs rewrite on deprecation notes for 2.5.1
Merge branch '2.5-dev' into bmbouter-1144501

Conflicts:
	docs/sphinx/user-guide/release-notes/2.5.x.rst
Merge pull request #1177 from pulp/bmbouter-1144501

1144501 - Renames TaskStatus.queue to TaskStatus.worker_name (reopened against 2.5.1)