* data: fix snapd.aa-prompt-ui.service to actually get started
The current snapd.aa-prompt-ui.service user service is dbus activated.
However this does not work with the latest prompt design.
* packaing: add snapd.aa-prompt-ui.service to auto-start
The implementation of these services is not yet ready, but in order to
be able to deliver it in a snap package, we need to have at least the
service files installed on the system by the distribution package.
These stubs just reexecute the binaries from the snap.
* tests: add spread test for reexec of prompt services
* packaging: update distros for prompt services
Ship them in Debian and Ubuntu, remove them elsewhere.
* cmd: update error message with unimplemented prompt services
* tests: do not disable prompt-reexec tests in UC
* many: disable prompting for 14.04
The kernel changes will most likely not land there.
* many: install prompt services for Ubuntu Core
* tests: exclude UC16 from reexec-prompt test
The services are installed, but disabled; enabling them is not trivial
and not worth the effort, since prompting will most likely not be
backported there.
* wrappers/core18: don't fail if the prompt service is missing in snapd
This fixes a spread failure in the tests/core/snapd-refresh-vs-services
test, where we install an old version of snapd (2.49) which does not
have the Prompt service.
* tests: fix typo in comment
Thanks @pedronis.
* cmd: add license header
Thanks @Meulengracht
