Before mult-signature support, the process of marking an app as
installed in the `InstalledAppProvider` didn't have any side effects
beyond its own table. Now, it is also responsible for calculating the
`suggestedVersionCode` of the associated app as well.
This means old tests around suggested versions no longer work. This is
because they would insert an App, and set the
`Cols.SUGGESTED_VERSION_CODE` using a `ContentValues`. This was then
overwritten by the `InstalledAppProvider` asking for the real
calculation for suggested versions. That is - it would check for
relevant apks and figure out which was best.
To make the old tests correct, they need:
* To be able to "install" apps with the correct signature.
* To insert the relevant apks into the database, not just depend on the
presence of an `app`.
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