Reliability fixes

- Prevent hang on start related to DNSSEC

- Timeout unavailable severs more quickly, which works around transient
  failures (previously wouldn't query a "dead" server for 900s)

- Limit TTL on NXDOMAIN responses

- Fixes for galaxy and linting

Change-Id: I95bf71ec2841e4036a6a14501e9ed285d5249732
diff --git a/Makefile b/Makefile
index 4176d9f..e32f68e 100644
--- a/Makefile
+++ b/Makefile
@@ -23,10 +23,13 @@
     -d "{extends: default, rules: {line-length: {max: 99}}}" \
     -s $(YAML_FILES)
 
+# List of molecule files, not including base molecule.yml which isn't ansible format
+MOLECULE_FILES ?= $(shell find molecule -type f -name '*.yml' \! -name 'molecule.yml' -print )
+
 ansiblelint: ## lint check with ansible-lint
 	ansible-lint --version
 	ansible-lint -v .
-	ansible-lint -v molecule/*/*
+	ansible-lint -v $(MOLECULE_FILES)
 
 license: ## Check license with the reuse tool
 	reuse --version