tests: Remove \r from source tree.

An ovsdb-server test had a literal carriage return in a check that
validates a directory name.  It isn't really necessary (who puts a carriage
return in a directory name?) and it does cause problems for passing around
patches via email, so just delete it.

CC: Arun Sharma <arun.sharma@calsoftinc.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>