Don't mark NetworkRequests restricted when they don't have restricted caps

Requests without NET_CAPABILITIES_INTERNET and just the default network
capabilities should not be marked restricted.  Without this fix apps
can hit permissions exceptions if they inadvertently make requests
without NET_CAPABILITIES_INTERNET.

Bug:23164917
Change-Id: I4c7136821315bcb05dfc42ffbc505a5d4f6109e6
(cherry picked from commit aae613d9)