Expand coverage of mergeinfo elision test in merge_tests.py.
Expand coverage of mergeinfo elision test in merge_tests.py.

* subversion/tests/cmdline/merge_tests.py
  (mergeinfo_elision): Test elision of merge target itself, not only elision
  of its children to itself.

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