Added import_tester to detect import loops

test/import_tester

+#! /bin/bash
+cd "$(dirname $0)/.."
+find scapy -name '*.py' | sed -e 's#/#.#g' -e 's/\(\.__init__\)\?\.py$//'  | while read a; do echo "######### $a"; python -c "import $a"; done