Revert "Feature/set subnet counts"

[aknysh]

what

• Reverts Feature/set subnet counts #54

why

• The PR needs improvements, does not work reliably in all cases
• When invoked with this configuration

max_subnet_count     = 4
public_subnet_count  = 2
private_subnet_count = 4

terraform apply produces these errors each time it runs with exactly the same settings including the number of provided AZs in var.availability_zones:

aws_subnet.private.0: Error creating subnet: InvalidParameterValue: Value (us-west-1b) for parameter availabilityZone is invalid. Subnets can currently only be created in the following availability zones: us-west-1c, us-west-1a.

aws_subnet.public.0: Error creating subnet: InvalidParameterValue: Value (us-west-1a) for parameter availabilityZone is invalid. Subnets can currently only be created in the following availability zones: us-west-1b, us-west-1c.

TODO

• Check the logic in the case when max_subnet_count is greater than the number of provided AZs