Glance Code Cleanup Round 1

[Rick Harris]

We have a few blemishes in the code-base that would be worth excising:

1. glance/store/backends is empty, we can ax this

2. glance/common/db is empty, we can ax this

3. Django-community gripe caught my attention:

Rick-Harriss-MacBook-Pro:trunk rick$ find . -name util*.py
./glance/common/utils.py
./glance/util.py
./tests/utils.py

I prefer utils, so I vote we rename glance/util -> glance/utils.py

4. ./run_tests -N is now producing tons of log messages even when it succeeds. We should probably silence that.

5. README is a little out of date, we can probably put something a little more useful in there.

6. tests/functional is empty. I vote we remove this directory and add back once we have a functional test. The counter-arg here is that this will gnaw at us so that we actually write a functional test. I don't buy it :)