Use NLM_F_REQUEST_ACK in createSetFlagsMessage()

This rtnl message is used with sendOneShotKernelMessage() which expects
that kernel returns an ACK. We need to set NLM_F_ACK explicitly for
that.

Bug: 390722214
Bug: 392491075
Test: Manually run the affected test, no more exception with EAGAIN.
Change-Id: I7ef9497461a8e89e9f7f7fe399562b2d8ede14a9
2 files changed