Don't fail when trying to add routes that already exist.
Previously, we suppressed failures for the special case of requestRouteToHost() being called multiple times. Turns out that other parts of the system also try to add duplicate routes, so just suppress EEXIST errors in general (as far as adding routes is concerned). For example, this happens when the WiFi P2P DHCP client renews its lease and blindly requests to add a route that it had already added before. (cherry picked from commit 64166e76) Bug: 17205769 Change-Id: I11d50052f616cb48a912d647b8024ccef01b736d
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