exec docker run statement. (#667)

Author: markusdap

container/incremental_load.sh.tpl

@@ -237,7 +237,5 @@ function read_variables() {
 # This is not executed if the single argument --norun is passed.
 if [ "a$*" != "a--norun" ]; then
   # This generated and injected by docker_*.
-  %{run_statements}
-  # Empty if blocks can be problematic.
-  echo > /dev/null
+  exec %{run_statements}
 fi