app: Make remote commands smarter wrt installations

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Currently "flatpak remotes" shows remotes across user and system
installations, but other remote commands (remote-delete, remote-modify,
remote-ls, remote-info) only work on one installation: the system one
unless overridden using --user or --installation. This commit changes
each command to infer the correct installation by checking which has
the specified remote. In case multiple installations have remotes by
the same name, the user is prompted to decide which to use.

This commit also adds unit tests and updates the man pages for the
aforementioned commands.

Fixes https://github.com/flatpak/flatpak/issues/787

Closes: #1205
Approved by: alexlarsson

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