lnd_test: use different fee policy in multi hop payment test
lnd_test: use different fee policy in multi hop payment test

This change makes the test more sensitive to bugs than a route
with nodes that all enforce the same fee policy.

In addition to that, the fee has been increased to a level
at which potential problems with improper fee calculation
become detectable (and not disappear in rounding).

aakselrod/lnd,aakselrod/lnd,LightningNetwork/lnd,LightningNetwork/lnd