Merge pull request #2272 from benthecarman/package-broadcast

Support broadcasting multiple transactions at once

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

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

diff --cc lightning/src/chain/channelmonitor.rs
Simple merge

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

diff --cc lightning/src/util/test_utils.rs
Simple merge