repaired structure and config.yaml for nspawn and docker

tests/Makefile

@@ -1,14 +1,6 @@
-# A workflow with modularity-testing-framework is still uncertain.
-# Only nspawn is actually used.
-# https://meta-test-family.readthedocs.io/en/latest/index.html
-#
 # Installation
-# $ sudo dnf install modularity-testing-framework python2-avocado
-# $ sudo /usr/bin/pip install behave
+# https://meta-test-family.readthedocs.io/en/latest/installation.html#installing-mtf
 test:
+	mtf-env-set
 	mtf-generator
-	MODULE=nspawn \
-	python -d -m avocado run \
-		--filter-by-tags=-WIP \
-		/usr/share/moduleframework/tools/modulelint.py \
-		*.py
+	mtf -l *.py

tests/config.yaml

@@ -2,10 +2,14 @@ document: modularity-testing
 version: 1
 name: ruby
 modulemd-url: https://src.fedoraproject.org/cgit/modules/ruby.git/plain/ruby.yaml
+packages:
+    rpms:
+        - ruby
 module:
     rpm:
-        repos:
-            - http://mirror.vutbr.cz/fedora/releases/26/Everything/x86_64/os/
+        url: http://ftp.fi.muni.cz/pub/linux/fedora/linux/releases/26/Everything/x86_64/os/
+    docker:
+        url: docker.io/centos/ruby-23-centos7
 test:
     version:
         - 'ruby -v'