lazr/__init__.py should not do a version test

lazr/__init__.py registers pre-PEP 420 namespace packages but does only for Python versions < 3.3. Python 3.3 is where PEP 420 was introduced so the version test attempts to avoid the old-style registration for Pythons that support PEP 420. This is broken however because the mere presence of lazr/__init__.py disables PEP 420 namespace packages. While Debian packaging tools will remove the lazr/__init__.py from all namespace portions when they build the >= Python 3.3 binary packages, if you are using something like `python3.4 setup.py install` on a project that is dependent on lazr.* packages, the lazr/__init__.py file will not get deleted, and thus neither PEP 420 nor old-style registration will happen. This makes lazr packages unimportable.

Since the upstream Python packaging tools have no inherent way of removing the lazr/__init__.py file, the solution is just to remove the version test and always use the old-style registration code.