avoid race conditions in read_*/write_* methods

using one RLock per Module
+ init generalConfig for all tests

Change-Id: I88db6cacdb4aaac2ecd56644ccd6a3e5fd2d1cf2
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/28005
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

test/conftest.py

@@ -1,6 +1,12 @@
 # content of conftest.py
 
 import pytest
+from secop.lib import generalConfig
+
+
+@pytest.fixture(scope="session", autouse=True)
+def general_config():
+    generalConfig.testinit()
 
 
 @pytest.fixture(scope="module")