Make all config values configurable

And use a standard scheme for variable/key naming

test/integration/default/default_test.rb

@@ -18,13 +18,14 @@ end
 
 describe file('/etc/strfry.conf') do
   it { should exist }
+  its('content') { should match(/name\s*=\s*"Test relay"/m) }
 end
 
 describe file('/var/lib/strfry') do
   it { should be_directory }
 end
 
-describe port(7777) do
+describe port(7778) do
   it { should be_listening }
   its('addresses') { should include '0.0.0.0' }
 end