* bzrlib/transport/ftp/_gssapi.py: (get_test_permutations): Replace all occurences of FTPServer by FTPTestServer to distinguish between the test front-end and the real server.
* bzrlib/transport/ftp/__init__.py: (get_test_permutations): Replace all occurences of FTPServer by FTPTestServer.
* bzrlib/tests/test_ftp_transport.py: Replace all occurences of FTPServer by FTPTestServer.
* bzrlib/tests/ftp_server/pyftpdlib_based.py: Replace all occurences of FTPServer by FTPTestServer. (BzrConformingFTPHandler): Fix odd capitalization.
* bzrlib/tests/ftp_server/medusa_based.py: Replace all occurences of FTPServer by FTPTestServer.
* bzrlib/tests/ftp_server/__init__.py: (_FTPServerFeature): Update docstring. (FTPTestServer): Replace all occurences of FTPServer by FTPTestServer.