git-svnimport: Use separate arguments in the pipe for git-rev-parse
git-svnimport: Use separate arguments in the pipe for git-rev-parse

Some people seem to create SVN branch names with spaces
or other shell metacharacters.

Signed-off-by: Matthias Urlichs <2e8175c327a6ef2d99764f30d3e9e7982997195e@smurf.noris.de>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git