Fix cowsay spacing

The cow speaking is a header, it should be "visually" grouped with the rest of the task output. Current output is like:

     COWSAY
     blank line
     blank line
     TASK OUTPUT
     blank line
     COWSAY
     blank line
     blank line
     TASK OUTPUT
     blank line

I think this should be 1 *blank line* between the cow and the current task output and 2 *blank lines* between one task and the next.

When using `ANSIBLE_NOCOWS=1` output is correctly grouped:

    TASK: [foo task] *********************
    TASK OUTPUT
    blank line
    TASK: [bar task] *********************
    TASK OUTPUT
    blank line