setup.py: rename name to python-libfdisk

Rename setuptools project name to fix source distribution filename from:

	libfdisk-1.X.tar.gz

to:

	python-libfdisk-1.X.tar.gz

Source distributions are created running:

	python setup.py sdist

setup.py

@@ -5,7 +5,7 @@ libfdisk = Extension('fdisk',
                     sources = ['fdisk.c', 'context.c', 'label.c',
                                'partition.c', 'parttype.c'])
 
-setup (name = 'libfdisk',
+setup (name = 'python-libfdisk',
        version = '1.2',
        description = 'Python bindings for libfdisk',
        ext_modules = [libfdisk])