Use shared config file for functional and util tests

The functional tests and util tests both require a config file that is
generated by ./configure. This commit merges those two config
files into a single configuration file that can be shared by both tests.

The config from config.ini is put into a Namespace object to maintain
the interface with bctest.py. A future commit could change this
interface to use a dictionary instead of a namespace.

.gitignore

@@ -100,7 +100,7 @@ coverage_percent.txt
 linux-coverage-build
 linux-build
 win32-build
-test/functional/config.ini
+test/config.ini
 test/cache/*
 
 !src/leveldb*/Makefile