docker dev start: check version of the "docker" package

Note: Not using logger since it doesn't seem to work

docker_dev_start.py

@@ -24,6 +24,12 @@
 __date__ = '2017-08-11'
 __updated__ = '2017-08-24'
 
+# Check the version of the "docker" package
+if docker.__version__ != '1.9':
+    print("the version of the docker package is {} instead of 1.9"
+          .format(docker.__version__))
+    sys.exit(1)
+
 def main(argv=None):  # IGNORE:C0111
     """Parse arguments and launch conversion
     """