Remove unused params and method regarding to community

Change-Id: I8b3512a694654c8baaa91cf03a0f3900d71ce860
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.

Change-Id: If9518c6fd7e6a18943c959339cfca72a504b8ee1
OS-483, mutiple members for second network

Change-Id: Ibe547adcd85773bf3ff663ff188abdf340ed9903
OS-479, DHCP service workflow fixes

    * dhcp_members was asigned but infoblox services wasnt restarted
    * dns server wasnt assigned in infoblox DHCP service

Change-Id: I8a5551f7504d0d5f6dddb61977628e0ea602376f

Conflicts:
	neutron/ipam/drivers/infoblox/ipam_controller.py
OS-505, restart infoblox services after create/update/delete subnet
OS-425/OS-495, setup option 54 during network creation

Change-Id: I7a292e98a603555a909169139f1b3895cd3a4833