When the development is moved from one branch to next in a git project
and we want to get all the open changes from old branch to the new branch,
we have to create a new copy of those changes for the new branch.
Since these changes are not required on the old branch, moving would be
a better fit than other propagation methods (cherrypicking, manual upload).
This change provides a REST API '/changes/{change-id}/move' to
move an open change to a different branch.
Change-Id: I44c68be1d08e2e1f4eab4e4f1724047f20072ac3
791f339090