Set variable for ipv4addrs in nios_inventory.py

[dmnagornyi]

Set inventory variable for ipv4addrs and mapped to ipv4addr attribute.

Without this line plugin gets ipv4addrs list from wapi but doesn't compose host variable in inventory.

RESULT:

[root@testhost]# INFOBLOX_MAX_RESULTS=1 ansible-inventory -i inventory.yml --list  --yaml

all:
  children:
    infoblox_hosts:
      hosts:
        testhost:
          Data Center: TestDatacenter
          Device Type: Server
          Site: TestSite
          ipv4addrs:
          - 192.168.1.1
          - 192.168.1.2
          view: 'DefaultView'

[dmnagornyi]

@JkhatriInfobox please take a look when you have a chance. Do you need anything else to approve it?