Fix-up for I28bcbab76: strip whitespace from clear_magick_tmp cronjob

Otherwise the newline at the end of the file confuses Puppet and causes log
churn.

Change-Id: I50f754c36d2af96ef7de3f70c17f34663426d9a5
Merge "Fix-up for I28bcbab76: strip whitespace from clear_magick_tmp cronjob" into production