NetworkManager brings ethernet interfaces up even when ONBOOT is set to no

Issue

• NetworkManager brings ethernet interfaces up even when the ONBOOT parameter is set to no. A link-local IPv6 address is assigned:

# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=2838d0d6-58b9-4b23-a42b-1781e723aa8f
ONBOOT=no
NM_CONTROLLED=yes
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
HWADDR=52:54:00:88:AD:30
PEERDNS=yes
PEERROUTES=yes

# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:88:ad:30 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5054:ff:fe88:ad30/64 scope link 
       valid_lft forever preferred_lft forever