Avoid opening unneeded RA sessions during merges.
Avoid opening unneeded RA sessions during merges.

Suggested by: rhuijben

* subversion/libsvn_client/merge.c
  (merge_cousins_and_supplement_mergeinfo, svn_client_merge3,
  svn_client_merge_peg3): Replace calls to svn_client_uuid_from_url with
  svn_client_uuid_from_path and avoid needlessly opening RA sessions.

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