Add modelschema test

  * Alligh run_tests.sh
    disable system-wide salt env - it's
    make no sense to test with non-isolated env.
    Extend some logging
  * Rename test pillar's
  * fix test pillar
  * fix auth_keys directory dependency
  * fix linux.system test process
  * fix known_host.sls - user actual user.name,instead of iterator one

Change-Id: I4a3a86e383136945433e7f33c37cf00b03ba1cdb
diff --git a/tests/test-requirements.txt b/tests/test-requirements.txt
new file mode 100644
index 0000000..a0f561a
--- /dev/null
+++ b/tests/test-requirements.txt
@@ -0,0 +1,2 @@
+jsonschema
+reno