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.

test/functional/test_runner.py

@@ -179,7 +179,7 @@ def main():
 
     # Read config generated by configure.
     config = configparser.ConfigParser()
-    configfile = os.path.abspath(os.path.dirname(__file__)) + "/config.ini"
+    configfile = os.path.abspath(os.path.dirname(__file__)) + "/../config.ini"
     config.read_file(open(configfile))
 
     passon_args.append("--configfile=%s" % configfile)