test: test commands during commit phase.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

test/commits/06-change-while-commit-outstanding.script

@@ -0,0 +1,28 @@
+# Test changes after committing but before receiving revocation.
+A:offer 1
+B:recvoffer
+A:commit
+A:offer 3
+
+# Now B receives that commitment and counter-commits.
+B:recvcommit
+B:commit
+
+A:recvrevoke
+A:recvcommit
+A:commit
+
+B:recvoffer
+B:recvrevoke
+B:recvcommit
+
+B:commit
+A:recvrevoke
+A:recvcommit
+B:recvrevoke
+
+checksync
+echo ***A***
+A:dump
+echo ***B***
+B:dump