git-svn: Print revision while searching for earliest use of path

git-svn: Print revision while searching for earliest use of path

When initializing a git-svn repository from a Subversion repoository,
it is common to be interested in a path which did not exist in the
initial commit to Subversion.  In a large repository, the initial fetch
may take some looking for the earliest existence of the path time while
the user receives no additional feedback.  Print the highest revision
number scanned thus far to let the user know something is still
happening.

Signed-off-by: Deskin Miller <deskinm@umich.edu>