Finally, eliminate hack/make.sh

The only thing hack/make.sh is now really doing is the
warning + sleep without SKOPEO_CONTAINER_TESTS .

So, make that a separate script, and eliminate the
hack/make directory.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

hack/test-integration.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+make PREFIX=/usr install
+
+echo "cd ./integration;" go test $TESTFLAGS ${BUILDTAGS:+-tags "$BUILDTAGS"}
+cd ./integration
+go test $TESTFLAGS ${BUILDTAGS:+-tags "$BUILDTAGS"}