[PATCH] svnsync init URL1 URL1

I discovered today by accident that trunk svnsync doesn't care if the
source and destination are the same:

> svnsync init file:///tmp/repos file:///tmp/repos
        Copied properties for revision 0 (svn:sync-* properties skipped).

This patch changes it to notice that:

> svnsync init file:///tmp/repos file:///tmp/repos
        ..\..\..\subversion\svnsync\main.c:632: (apr_err=195012)
        svnsync: Cannot sync a repository to another with the same UUID

The run_test() function in svnsync_tests took advantage of this by setting the
mirror's UUID to the source's UUID as soon as it created the mirror. This
patch makes it not do so until it finished running svnsync.

This only touches the 'initialize' command, so it doesn't prevent people
from setting their mirrors' UUID to the mirrored repos's UUID after they
initialize the mirror.

Passes svnsync_tests.py.

[[[
In svnsync, do not allow source and destination to be the same repository.

* subversion/svnsync/main.c
  (do_initialize):
    Return an error when FROM_UUID equals TO_UUID.

* subversion/tests/cmdline/svnsync_tests.py
  (uuid): Import.
  (run_test): Defer setting the mirror repository's UUID to the source
    repository's UUID to just before comparing the dumpfiles.
]]]

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