Merge pull request #1529 from wpaulino/move-channel-config-static-fields

Move ChannelConfig static fields to ChannelHandshakeConfig

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

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

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

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

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

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