disable default license checkout on LicenseChecker (#636)

Author: akaszynski

ansys/mapdl/core/licensing.py

@@ -391,15 +391,16 @@ def checkout_license(self, host=None):
         else:
             self._license_checkout_success = True
 
-    def start(self, license_file=True, checkout_license=True):
+    def start(self, license_file=True, checkout_license=False):
         """Start monitoring the license file and attempt a license checkout.
 
         Parameters
         ----------
         license_file : bool, optional
             Start the license file thread.
         checkout_license : bool, optional
-            Start the checkout license thread.
+            Start the checkout license thread.  By default this is
+            disabled.
 
         """
         if license_file: