snapcraft 2.0 yaml changes affecting the review tools, store and snappy and snapcraft itself.

[Sergio Schvezov]

A yaml change to follow the new internal format and unify some of the
language that we were using has just landed in master[1]. I've created
https://bugs.launchpad.net/click-reviewers-tools/+bug/1532842 to track
affected components.

So what does this mean:

- binaries and services are now just apps
- the additional keywords for licenses have changed.
- frameworks are no longer allowed (in preparation for capabilities). The
reason is, among all others, we don't want to lead people down a path that
will soon no longer exist.
- given the former, framework-policy is no longer allowed.
- security-override, security-policy and caps will still be allowed until
the capabilities feature lands.
- A snap.yaml is generated, but for backwards compatibility, a package.yaml
and readme.md is also created.

Work items:
- the store should start parsing snap.yaml
- snappy can begin its migration away from package.yaml and readme.md
- review tools should start checking snap.yaml (maybe warn about
package.yaml and readme.md)

Once this is done, we will remove the backwards compatible (transitional)
package.yaml and readme.md

As a reminder and as stated before, snapcraft 2.0 targets Xenial Xerus
(16.04) and will be released regularly only to the xenial archives.

Cheers
Sergio

[1]
https://github.com/ubuntu-core/snapcraft/commit/ca31dcd69ef33f5b183145be59532afa66073ec6
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