Code coverage tests for net_socket.cc (#1840)

* Code coverage UTs for net_socket.cc

* Addressed review comments

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Co-authored-by: Atul Kulkarni <atul.kulkarni@amd.com>

[ROCm/rccl commit: c288fbf1b2]

projects/rccl/test/CMakeLists.txt

@@ -142,10 +142,11 @@ if(BUILD_TESTS)
       AllocTests.cpp
       ArgCheckTests.cpp
       BitOpsTests.cpp
-      IpcsocketTests.cpp
       CollRegTests.cpp
       CommTests.cpp
       EnqueueTests.cpp
+      IpcsocketTests.cpp
+      NetSocketTests.cpp
       P2pTests.cpp
       ProxyTests.cpp
       RcclWrapTests.cpp