Add test for StructInetDiagSockId

Upcoming CL will modify StructInetDiagSockId.
So, as a preparation, this CL adds test for existing behavior of
StructInetDiagSockId.

Bug: 217624062
Test: atest NetworkStaticLibTests
Change-Id: I6ef475bec050ba2689a8df6182be36a6fccd9bfb
1 file changed
tree: 649ce99b1abbeea899415a864b8077c91ddb21c9
  1. staticlibs/