CA-107242: license expiry: remove periodic scheduler callback

We are going to implement this differently.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
CA-107242: license expiry: add optional param "force" to host.apply_edition

...and use this in the xapi startup code, instead of the existing "startup" key,
in the apply_edition call to v6d.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
Merge pull request #1263 from robhoes/licensing

CA-107242: add optional param "force" to host.apply_edition