Add SocketUtils CTS tests

Test APIs below:
makeNetlinkSocketAddress(int, int)
makePacketSocketAddress(short, int)
makePacketSocketAddress(int, byte[])
closeSocket(java.io.FileDescriptor)

Bug:129200596
Test: atest FrameworksNetTests
      atest CtsNetTestCases --instant

Change-Id: I395360161123d8b712b6c2cf3251b8144641350e