do not convert string to float

a read method should not reply on the automatic conversion
of the return value from string to a number.

- transitional solution with generalConfig.lazy_numer_validation
+ changing slighly generalInit mechanism: for above feature
  generalConfig.init is not required to be called (i.e. when
  used on the client side)

Change-Id: Ibecce1a45669273c105932acdc0908de55bfd1b9
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27516
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

test/test_logging.py

@@ -112,8 +112,7 @@ def init_(monkeypatch):
                 def communicate(self, request):
                     self.comLog('> %s', request)
 
-            generalConfig.init()
-            generalConfig.comlog = comlog
+            generalConfig.testinit(logger_root='frappy', comlog=comlog)
             logger.init(console_level)
             self.srv = ServerStub()
 
@@ -139,7 +138,7 @@ def init_(monkeypatch):
 
     yield Playground
     # revert settings
-    generalConfig.__init__()
+    generalConfig.testinit()
     logger.__init__()