Fix log_test-17 failure over ra_dav.  The problem was one of allocating a persistent object in the local pool.
Fix log_test-17 failure over ra_dav.  The problem was one of allocating a
persistent object in the local pool.

* subversion/svn/log-cmd.c
  (log_receiver_baton): Add pool for persistent allocations.
  (log_message_receiver): Allocate merge frames from the persistent pool.
  (svn_cl__log): Initialize baton pool value.

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