* feat: Changes for migrating resources to GLB module
* Updated Readme
* Added support for null description
* Added support for empty string
* Added default optional values
* Changed Readme
* Corrected description according to readme
* Added name and description changes for net-lb-app-ext-regional
* Added name and description changes for net-lb-app-int
* Added name and description changes for net-lb-app-int-cross-region
* Added name and description changes for net-lb-proxy-int
* Added name and description changes for net-lb-ext
* Added name and description changes for net-lb-int
* Changed Readme docs
Load balancers can be configured with IAP-enabled backends.
They can either be configured to use external Identity Providers (IdP)
or to use Cloud Identity. The latter is the default and is used when
the OAuth2 parameters are not specified.
The iap_config parameter in the backend_service_configs variable
already supported the external IdP option, but did not support the
default one.
## net-lb-int
* Fix error on apply of example:
```
Error creating RegionBackendService: googleapi: Error 400: Invalid value for field 'resource.backends[0].balancingMode': 'UTILIZATION'. Balancing mode must be CONNECTION for an INTERNAL backend service., invalid
```
* remove unused `balancing_mode` variable, as only one value is possible anyhow
## net-lb-ext
* update in the `backends` description
## net-lb-proxy-int
* update in the `backends` description
## net-lb-app-int
* added validation of `balancing_mode`
* fixed other validations
## net-lb-app-ext
* added validation of `balancing_mode`
* fixed other validations
* removed validation for `locality_lb_policy` as this variable is not used in this module
Closes: #1767
