Add Solaris support to ncm-cron.

This change involves:
* Adding a new variable securitypath to identify where the
cron.allow/deny files live
* Added processing to share crontab files with users on Solaris. This is because Solaris uses an old version of cron.
* Solaris specific cron tests.
* Updated pan files for securitypath
* Add noaction support
* Fix unit test bug

The most interesting change involves the shared use of user crontabs. To
make this work ncm-cron uses the concept of separate file sections
within the crontab.  The ncm section is identified by the use of the
tags NCM-CRON BEGIN:and NCM-CRON END:. Entries either side of these
section identifiers are not modified.

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