build: create all augeas test files in same dir as their source

build: create all augeas test files in same dir as their source

The current make rules are inconsistent about which directory the
augeas test files are created in. Put them all in the same dir as
their source.

Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>