Change format of dhcp_subnets to be a dict

Top level key is now subnet CIDR, rather than a list containing dicts,
where subnet is a sub-key, so better structured

- Update to pass more modern ansible-lint
- Fix galaxy info
- Format filter plugin w/black
- BSD fixes - paths, listening IP for tftpd server

Change-Id: I490331bc2998f2afbef135545500d1fa07b626ff
diff --git a/Makefile b/Makefile
index 9ce7e2e..e797d50 100644
--- a/Makefile
+++ b/Makefile
@@ -26,10 +26,13 @@
     -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