Merge pull request #1124 from jkczyz/2021-10-default-channel-scoring

Add channel scoring to get_route

diff --cc fuzz/src/full_stack.rs
Simple merge

diff --cc lightning/src/ln/channelmanager.rs
Simple merge

diff --cc lightning/src/ln/functional_test_utils.rs
Simple merge

diff --cc lightning/src/ln/functional_tests.rs
Simple merge