Consolidate password validation messaging

salt/common/tools/sbin/so-common

@@ -99,6 +99,15 @@ check_password() {
 	return $?
 }
 
+check_password_and_exit() {
+	local password=$1
+	if ! check_password "$password"; then
+		echo "Password is invalid. Do not include single quotes, double quotes, dollar signs, and backslashes in the password."
+		exit 2
+	fi
+	return 0
+}
+
 check_elastic_license() {
 
 	[ -n "$TESTING" ] && return