LACP bonding support

[kvaps]

Add the option to select multiple interfaces and configure bonding on them

[kvaps]

example configuration:

BONDING_OPTS="mode=802.3ad downdelay=0 miimon=100 updelay=0"
TYPE=Bond
BONDING_MASTER=yes
HWADDR=
PROXY_METHOD=none
BROWSER_ONLY=no
IPV6INIT=no
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=bond0
UUID=567bcef2-1918-4e7d-be64-2af1359c2790
DEVICE=bond0
ONBOOT=yes
IPV6_DISABLED=yes