the data_path.
* server-src/driver.c: Check FAILED result after PORT command.
* server-src/driverio.c: Send data_path in taper PORT-WRITE command.
* server-src/taper.pl: Parse data_path in PORT-WRITE command, call the
  scribe check_data_path method.
* installcheck/taper.pl: Test it.


git-svn-id: https://amanda.svn.sourceforge.net/svnroot/amanda/amanda/branches/3_1@3136 a8d146d6-cc15-0410-8900-af154a0219e0