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/config.ini.in

@@ -1,18 +0,0 @@
-# Copyright (c) 2013-2016 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-# These environment variables are set by the build process and read by
-# test/functional/test_runner.py
-
-[environment]
-SRCDIR=@abs_top_srcdir@
-BUILDDIR=@abs_top_builddir@
-EXEEXT=@EXEEXT@
-
-[components]
-# Which components are enabled. These are commented out by `configure` if they were disabled when running config.
-@ENABLE_WALLET_TRUE@ENABLE_WALLET=true
-@BUILD_BITCOIN_UTILS_TRUE@ENABLE_UTILS=true
-@BUILD_BITCOIND_TRUE@ENABLE_BITCOIND=true
-@ENABLE_ZMQ_TRUE@ENABLE_ZMQ=true

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)