DO NOT MERGE:Add missing SOCK_CLOEXEC flag when opening socket

Go through the code that opens socket in marshmallow, and backport the
SOCK_CLOEXEC usage when opening sockets with AF_NETLINK.
Bug: 31242981
Test: mma

Change-Id: I709fc1dd43a883f95bb99021e1350c062ca35203
2 files changed