Switch the order of gcp buildNetworks func to be more go-like
Switch the order of gcp buildNetworks func to be more go-like

The current implementation returns error as the first parameter, 
but it is usually the last parameter.
terraform-providers/terraform-provider-google,terraform-providers/terraform-provider-google,rosbo/terraform-provider-google,selmanj/terraform-provider-google,hashicorp/terraform-provider-google,drebes/terraform-provider-google,drebes/terraform-provider-google,hashicorp/terraform-provider-google-beta,terraform-providers/terraform-provider-google,hashicorp/terraform-provider-google-beta,ubschmidt2/terraform-provider-google,nickithewatt/terraform-provider-google,hashicorp/terraform-provider-google,drebes/terraform-provider-google,rosbo/terraform-provider-google,selmanj/terraform-provider-google,hashicorp/terraform-provider-google-beta,drebes/terraform-provider-google,terraform-providers/terraform-provider-google,ubschmidt2/terraform-provider-google,hashicorp/terraform-provider-google,hashicorp/terraform-provider-google-beta,ubschmidt2/terraform-provider-google,rosbo/terraform-provider-google,ubschmidt2/terraform-provider-google,hashicorp/terraform-provider-google,nickithewatt/terraform-provider-google,rosbo/terraform-provider-google,selmanj/terraform-provider-google,nickithewatt/terraform-provider-google,terraform-providers/terraform-provider-google