This replaces the hard-coded path to the `postgres` and `initdb` binaries with
a slightly more flexible search. It'll pick the newest version installed.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
We will soon have a postgres backend as well, so we need a way to control the
postgres process and to provision DBs to the nodes. The two interfaces are the
dsn that we pass to the node, and the python query interface needed to query
from tests.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
