Initial tests for the happy path.
Explicitly stop nodes
Renaming.
Test deciding not to rename.
And another test.
Rename again.
And clean up.
Don't assume argument-pairs to rename_cluster_node go in any order. Add tests for partial renaming. Refactor a bit. Test more ways to fail.
Another test, plus comments.
Rename these for better FILTERing.
Clarify failing tests, add another failure (impersonating a node which is not onvolved in the cluster at all).
Renaming twice is now not allowed.
Merge in default.
merge bug26475 into default