add serviceman comments

manager/dist/Library/LaunchDaemons/_rdns_.plist.tmpl

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
+<!-- Generated for serviceman. Edit as you wish. -->
 <dict>
 	<key>Label</key>
 	<string>{{ .ReverseDNS }}</string>

manager/dist/etc/systemd/system/_name_.service.tmpl

@@ -1,3 +1,4 @@
+# Generated for serviceman. Edit as you wish.
 # Pre-req
 # sudo mkdir -p {{ .Local }}/opt/{{ .Name }}/ {{ .Local }}/var/log/{{ .Name }}
 {{ if .System -}}