Tests: minor fixes.

Fixed temporary dir removing.
Fixed printing path to log.
Module checks moved to the separate file.

test/unit/check/tls.py

@@ -0,0 +1,13 @@
+import re
+import subprocess
+
+
+def check_openssl(unitd):
+    subprocess.check_output(['which', 'openssl'])
+
+    output = subprocess.check_output(
+        [unitd, '--version'], stderr=subprocess.STDOUT
+    )
+
+    if re.search('--openssl', output.decode()):
+        return True