[PATCH] addcommand line option to svn-backup-dumps.py to specify svnadmin and svnlook paths

Hi.

I added the feature to specify svnadmin and svnlook paths
by command line options.

[[[
   add two command line options, --svnadmin-path and --svnlook-path
   to svn-backup-dumps.py

   When --svnlook-path option is specified, use the parameter as
   svnlook path to get the youngest revision of a repository.

   When --svnadmin-path option is specified, use the parameter as
   svnadmin path to dump a repository.

   * tools/server-side/svn-backup-dumps.py
     (SvnBackup.__init__): add two member variables, __svnadmin_path and
                           __svnlook_path to hold command line parameters
     (SvnBackup.get_head_rev): use the member variable __svnlook_path instead
                               of contant string "svnlook".
     (SvnBackup.create_dump): use the member variable __svnadmin_path instead
                               of contant string "svnadmin".
   ]]]

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