Followup to r1220740, fix a FAIL caused by libmagic not treating as text a file containing a single alphanumeric character.
Followup to r1220740, fix a FAIL caused by libmagic not treating as text
a file containing a single alphanumeric character.

* subversion/tests/cmdline/log_tests.py
  (guarantee_repos_and_wc): Put more than a single character in new file.
  (log_diff): Expect new content.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion