Http redirections are not followed by default. Do not use hints
anymore.

* bzrlib/transport/smart.py:
(SmartTransport.get): Do not use hints.

* bzrlib/transport/sftp.py:
(SFTPTransport.get): Do not use hints.

* bzrlib/transport/memory.py:
(MemoryTransport.get): Do not use hints.

* bzrlib/transport/local.py:
(LocalTransport.get): Do not use hints.

* bzrlib/transport/http/_urllib2_wrappers.py:
(Request.__init__): Redirections are *not* followed by default.

* bzrlib/transport/http/_urllib.py:
(HttpTransport_urllib._get): Do not use hints.

* bzrlib/transport/http/_pycurl.py:
(PyCurlTransport._get): Do not use hints.

* bzrlib/transport/http/__init__.py:
(HttpTransportBase.get, HttpTransportBase._get): Do not use hints.
Fix _get doc anyway.

* bzrlib/transport/ftp.py:
(FtpTransport.get): Do not use hints.

* bzrlib/transport/fakevfat.py:
(FakeVFATTransportDecorator.get): Do not use hints.

* bzrlib/transport/decorator.py
(TransportDecorator.get): Do not use hints.

* bzrlib/transport/chroot.py:
(ChrootTransportDecorator.get): Do not use hints.

* bzrlib/tests/test_transport_hints.py:
Deleted.

* bzrlib/tests/__init__.py:
(test_suite): Do not test hints.

* bzrlib/errors.py:
(UnknownHint): Deleted.

* bzrlib/bzrdir.py:
(BzrDirMetaFormat1.probe_transport): Do not use hints.