Use driver pattern for e2e tests (#829)

I've moved all the logic relevant to WBIO into a single file in order to
be able to replace it.
I have tried to upgrade WDIO in order to use the latest version and it
got stuck on my computer.
Furthermore, I was not able to run it locally which made this whole
cycle very long.
After this will be merged I will replace WDIO with cypress.
This doesn't change anything, only moves some code in the tests to a
single file, removes unneeded files and uses the driver pattern, which
will later allow switching the underline WDIO with Cypress.

cc: @nyurik

test/config/specs.js

@@ -1,6 +1,11 @@
-var config = {};
-config.testNetwork = process.env.TEST_NETWORK || "localhost";
-config.port = 9001;
-config.baseUrl = "http://"+config.testNetwork+":"+config.port;
+
+const testNetwork = process.env.TEST_NETWORK || "localhost";
+const port = 9001;
+const baseUrl = `http://${testNetwork}:${port}`;
+const config = {
+    testNetwork,
+    port,
+    baseUrl
+};
 
 module.exports = config;