* Make use of name_prefix optional

* Code cleanups, add example

Using name_prefix instead of name to allow creation of duplicated with create_before_destroy (fix #40)

In order to avoid https://github.com/hashicorp/terraform/issues/18195

* added rdp-udp, fixed typo in mssql-broker-tcp

* adding rdp-udp as default

* Ran update_groups.sh

* Workaround for bug when updating description of a rule with protocol all

Error:

"Error updating security group rule description:
InvalidParameterValue: When protocol is ALL, you cannot specify
from-port."

Issue:
https://github.com/terraform-providers/terraform-provider-aws/issues/1920

* Add known issues to README

This reverts commit 1684912d.

* Add redshift tcp port

* add redshift to auto_groups and generated with update_groups.sh