nrpe charm should have ability to specify tailoring file for CIS audit

[Bartosz Woronicz]

Currently the nrpe checker supports only the following options

cis_audit_enabled | boolean
cis_audit_profile | string
cis_audit_score | string

None of them allow to specify tailoring file when running audit.
That is especially crucial for complicated deployments like Openstack when hardening is done against multiple application with different requirements, so the tailoring allows to enable or disable some rules and achieve score 1.0.

I suggest new option

cis_audit_tailoringfile | string

That will be required for future Charmed Openstack and Canonical Openstack deployments to be able to setup this information.

If you require more details here please let me know.

[Bartosz Woronicz (mastier1)]

Marking Field High as that will be required in the coming project

[Andrea Ieri (aieri)]

Marking as invalid as charm-nrpe bugs are now tracked at https://github.com/canonical/charm-nrpe/issues
The conversation can continue at https://github.com/canonical/charm-nrpe/issues/186