Added directory check to cron job creation.

Added ability to check for directory so that this cron job
creation will work in both RPM-based distributions as well
as in DEB-based distributions.

(Found entity problem with '&' character - fixed.)

Updated to use operating-system specific screen tags.

Fixes bug: 1299674

Change-Id: I1b4b3111da0e3859d38c8963fe5e45432682f284
Merge "Added directory check to cron job creation."