Extend a test to address the concerns of issue #3623.
Extend a test to address the concerns of issue #3623.

* subversion/tests/cmdline/merge_tests.py
  (foreign_repos): Extend this test a bit to really verify that what
    was merged from a foreign repos, and committed, is *really* what we
    expected.

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