(#22535) Make a full status object the default in agent spec tests.

Prior to this patch, the default stubs for the find indirection returned
a bare Puppet::Status object, i.e. without setting the version field in the hash,
and the one test that needed the version field overrode that stub with one
providing a status object with a version field.

This is the opposite of what happens in the code, where by default one would
expect Puppet::Status to include a version field, and it's an unusual condition
(older master) for it to omit the version field.  So this patch reverses things
so that the default stub of Puppet::Status includes a version field, and the
one test that needs no version field (for validating the case of an older master)
overrides *that*.