* add service attachment support to lb app int module
* allow direct referencing of self managed ig in ilb module
* add service attachment support to net-ilb-int
* add service attachments example to net-lb-int
* fix resource name in net-lb-ext
* rename fwd rules resource in test inventories
* add toc to net-lb-int
This PR changes variable region's default value in example tests to real region value.
Some of the modules parse the region name to decide whether to create regional or zonal resources.
