Tweak to start.sh script (minor)

[stl-steve-moore]

The start.sh script has several places where it creates a folder (mkdir ....). If the folder already exists, the system will complain.

An easy way to get around that is to use "mkdir -p". That option tells the OS to make the directory if it does not already exist. Warning messages will go away.

It will also make an intermediary directories along the path, but I don't think you need that for the folders the script makes today.