OS-505, restart infoblox services after create/update/delete subnet
Legacy code bug fixes
Merge pull request #23 from Vegasq/dhcrelay_agent_fixes

Legacy code fixes
Merge pull request #15 from Vegasq/OS-505

OS-505, restart infoblox services after create/update/delete subnet
OS-432 Update existing NIOS network on subnet create

In case
 a. user creates a subnet for shared or external network
 b. NIOS network with the same CIDR exists
Update existing network, rather than raising an error.