Add Solaris support to ncm-cron.

This change involves:
o Adding a new variable securitypath to identify where the
cron.allow/deny files live
o Added processing to share crontab files with users on Solaris. This
is because Solaris uses an old version of cron.
o Solaris specific cron tests.
o Updated pan files for securitypath

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.
Make noaction safe and refactor code

Code called unlink directly which meant that it was not noaction safe.
Switched to using LC::Check::absence as it supports noaction.

Tidied up the code and moved some repetetive sections to their own
functions.
Fixed unit tests

Switching unlink for LC::Check::absence exposed a long standing bug
where the unit tests were trying to delete files in /etc/cron.d but
silently failing. The module was correctly flagging up the failure via
using $self->error(...) however these errors are ignored by the unit
testing system.

LC::Check is not unit test safe so added mocked methods for
LC::Check::status and LC::Check::absence to the linux configure test.
Updated oldSolarisFile naming and added comment
Fixed solaris env vars, file perms and added cron refresh

Solaris cron ignores environment variables on the preceding line (linux
style).

Solaris does not check to see if the crontabs have been changed so the
cron daemon needs to be refreshed.

Fixed file permission problems with solaris crontabs
Merge pull request #201 from NZJourneyMan/solaris

Add Solaris support to ncm-cron.