Migrate auth token between workspaces so that dont need to re-auth again for each workspace.

[liujianuuei]

One user could have more than one workspace and for these workspaces, plugin should help Migrate auth token between these workspaces so that user don't need to re-auth again for each workspace.

[liujianuuei]

Maybe we can store token in Eclipse self instead of workspace, in such case there is no need to do migration.