Escape hashes in password for config file

The hash is the comment character in the config file, even if it occurs
in the middle of the password. This can be worked around however by
escaping it.

This fixes #16.

collector.go

@@ -185,7 +185,7 @@ func freeipmiConfig(config IPMIConfig) string {
 		fmt.Fprintf(&b, "username %s\n", config.User)
 	}
 	if config.Password != "" {
-		fmt.Fprintf(&b, "password %s\n", config.Password)
+		fmt.Fprintf(&b, "password %s\n", escapePassword(config.Password))
 	}
 	if config.Timeout != 0 {
 		fmt.Fprintf(&b, "session-timeout %d\n", config.Timeout)
@@ -515,6 +515,10 @@ func contains(s []int64, elm int64) bool {
 	return false
 }
 
+func escapePassword(password string) string {
+	return strings.Replace(password, "#", "\\#", -1)
+}
+
 func targetName(target string) string {
 	if targetIsLocal(target) {
 		return "[local]"