BUG: Do not clobber Git origin pushurl.

The SetupForDevelopment.sh will overwrite the Git origin pushurl to the
ITKData repository because the ITKData submodule has been removed.

Change-Id: I044d90935ee0f4da353eb6afa4e7a71bbcd97046
Merge topic 'git-origin-pushurl'

04454af BUG: Do not clobber Git origin pushurl.