This refactors the confirmation component to use sinon instead of
manually checking the the result of calling a function.

Newer versions of npm don't autoinstall peer dependencies, so they
have to be explicitly installed in package.json. This adds the few
that npm was complaining about.

Defaults to True. Without it, the confirmation modal doesn't show and
you aren't able to remove a provider from the list.

If is set keyamanger will try to discover and download the key.

- Resolves: #8821

As a couple of initial, example tests, Center and Confirmation were
refactored and tests were set up and added with mocha, enzyme and
chai. Spinner was also refactored.

Previously, if the active VPN was in the connecting state and the VPN
status component for another account was rendered the status for the
new account would show as connecting. This was because it didn't check
the domain returned from the status endpoint when parsing the returned
data and setting "connecting" as the status. We can safely assume that
a non active VPN is in the "down" state, so that's what this commit
does.