base dockerfile optimization: reduction of the layer (#973)

By changing the file permissions of "check-grid.sh" it is no longer
necessary to change the permissions during the image build.
This saves a dockerlayer and therefore memory and resources.

Author: kaifried

Base/Dockerfile

@@ -60,7 +60,6 @@ RUN  mkdir -p /opt/bin
 # Add Grid check script
 #======================================
 COPY check-grid.sh entry_point.sh /opt/bin/
-RUN chmod +x /opt/bin/check-grid.sh
 
 #======================================
 # Add Supervisor configuration file