Update reserved start addresses for a new subnet
Update reserved start addresses for a new subnet

This commit updates the calculated reserved start addresses for a new subnet.

It appears that the outputs for a new subnet within createUiDefinition now return a startAddress
of 10.0.0.0 instead of 10.0.0.1, assuming address prefix size 10.0.0.0/25. 10.0.0.0-10.0.0.3
are reserved addresses, so calculate the first available address as 10.0.0.4.

elastic/azure-marketplace,elastic/azure-marketplace