Merge pull request #2213 from benthecarman/error-sign-provider-addrs

Allow get_shutdown_scriptpubkey and get_destination_script to return an Error

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

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

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

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

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