make control_ip_list optional, so we are allowed to install analytics/config only without control
make control_ip_list optional, so we are allowed to install analytics/config
only without control

Change-Id: I7ce37f25b961f3ad3969936d5965e115dac19aec
Closes-Bug: #1601897

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils