Unsigned integer overflow sanitization for netd/server

Enable unsigned-integer-overflow sanitization for netd/server
(libnetdaidl, netd, ndc).

This does not cause any aborts on CtsNetTestCases (includes
android.net.cts.VpnServiceTest), CtsNetTestCasesLegacyApi22, and
CtsNetTestCasesLegacyPermission22.
(Some tests are finicky and need to be re-run individually to pass; there is similar behavior on the unsanitized build.)

Change-Id: I021bae3cf20df7669822977d3221a44f207614a8