Disable logging in NetlinkTracker.

This logging can get quite spammy in GoogleGuest, and there's
currently no reason to think it's necessary. Much of the same
information is available via "adb shell ndc monitor".

Bug: 16328180
Change-Id: I15a8348e261d6b69a4ef8bdaf8a2a431b1c2bc0d
1 file changed