Make travis check that msg_targets match the template

Author: TheBlueMatt

fuzz/fuzz_targets/msg_targets/gen_target.sh

@@ -1,4 +1,4 @@
-for target in CommitmentSigned FundingCreated FundingLocked FundingSigned OpenChannel RevokeAndACK Shutdown UpdateAddHTLC UpdateFailHTLC UpdateFailMalformedHTLC UpdateFee UpdateFulfillHTLC AcceptChannel ClosingSigned; do 
+for target in CommitmentSigned FundingCreated FundingLocked FundingSigned OpenChannel RevokeAndACK Shutdown UpdateAddHTLC UpdateFailHTLC UpdateFailMalformedHTLC UpdateFee UpdateFulfillHTLC AcceptChannel ClosingSigned; do
 	tn=$(echo $target | sed 's/\([a-z0-9]\)\([A-Z]\)/\1_\L\2/g')
 	fn=msg_$(echo $tn | tr '[:upper:]' '[:lower:]')_target.rs
 	cat msg_target_template.txt | sed s/MSG_TARGET/$target/ > $fn

fuzz/travis-fuzz.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
 set -e
+
+pushd fuzz_targets/msg_targets
+rm *_target.rs
+./gen_target.sh
+[ "$(git diff)" != "" ] && exit 1
+popd
+
 cargo install --force honggfuzz
 for TARGET in fuzz_targets/*.rs fuzz_targets/msg_targets/*_target.rs; do
 	FILENAME=$(basename $TARGET)