Revert "delete e2e"

This reverts commit 71db49e.

e2e/Makefile

@@ -0,0 +1,22 @@
+DOCKER := $(shell which docker)
+TEST_CONTAINERS=$(shell docker ps --filter "label=ibc-test" -a -q)
+
+cleanup-ibc-test-containers:
+	for id in $(TEST_CONTAINERS) ; do \
+		$(DOCKER) stop $$id ; \
+		$(DOCKER) rm $$id ; \
+	done
+
+init:
+	./scripts/init.sh
+
+e2e-test: init cleanup-ibc-test-containers
+	./scripts/run-e2e.sh $(test) $(entrypoint)
+
+e2e-suite: init cleanup-ibc-test-containers
+	RUN_SUITE="true" ./scripts/run-e2e.sh "" $(entrypoint)
+
+compatibility-tests:
+	./scripts/run-compatibility-tests.sh $(release_branch)
+
+.PHONY: cleanup-ibc-test-containers e2e-test compatibility-tests init