Replace site-package path in httpd config in distutils build

I was installing from source and having to manually change adagios.conf seemed redundant work. It's a bit messier than the sed one-liner in the .spec file but I still think it's cleaner.

I removed two sed lines from the .spec. It looks like the one in the %build phase is replacing the line in the source itself after it gets built into the build/ directory so it doesn't seem to do anything. The second is basically what I implemented in setup.py.