Remove TODO's requesting module move of Socket mock classes

This was already done.

test/classes/core/api/io/MockPosixReader.hpp

@@ -15,7 +15,7 @@
 
 namespace ls_std_core_test
 {
-  class MockPosixReader : public ls::std::common::interface_type::IPosixReader // TODO: move to "common" module
+  class MockPosixReader : public ls::std::common::interface_type::IPosixReader
   {
     public:
 

test/classes/core/api/socket/MockPosixSocket.hpp

@@ -15,7 +15,7 @@
 
 namespace ls_std_core_test
 {
-  class MockPosixSocket : public ls::std::common::interface_type::IPosixSocket // TODO: move to "common" module
+  class MockPosixSocket : public ls::std::common::interface_type::IPosixSocket
   {
     public: