Some minor adjustments to PR

Add unifi_dynamic_dns resource

Fixes paultyng#126

Add note about a tf specific user

See paultyng#125

Bump SDK to 1.13.3

Implement static WAN configuration in unifi_network

Support importing networks by name

- E.g. `terraform import unifi_network.mynetwork name=LAN`
- TODO: tests

Add no2ghz_oui to unifi_wlan resource

Fix wan_type flapping

Fixes paultyng#99

Bump index on firewall rule to avoid conflict