Use case: User setup a new local repository. And later decides to pull changes from a remote repository.

As of now, jGit does not allow to pull branch which is not checked out. There are two workarounds for this

1) Do a remote fetch; Checkout the remote branch.

OR

2) Do a remote fetch; Create a branch which tracks the remote branch; Checkout the newly created branch

This issue is to support Option 1) workflow.

Note: Option 2) involves three steps and currently we support this.