Fix for test test_present_with_subnets
Fix for test test_present_with_subnets

The test
unit.states.test_boto_vpc.BotoVpcRouteTableTestCase.test_present_with_subnets
creates 2 subnets in VPC specifying the same CIDR for them. As
documentation says:

> The CIDR block must not overlap with any existing CIDR block that's
associated with the VPC.

This sets different CIDR blocks for 2 subnets that test creates.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt