Classic confinement request for landscape-api

The current landscape-api snap is a repackage of the deb to support present and future series which don’t have python2 dependencies. Classic confinement is required to allow the API client to continue handling arbitrary scripts, attachments, packages and custom certs.

Note the currently published snap is using strict confinement, thus only has partial functionality without --devmode.

Requirements understood since it fits under the public cloud agent category. Granting use of classic. This is now live