Rearranged "master_connection_tests.c"
'terminateMasterConnection()' close socket
Test case rename

"Return negative" -> "Fail" because the negative number '-1' is
abstracted with a macro that says "FAILURE"
'readFromMaster()' log null pointer

'readFromMaster()' log if called with 'NULL' for destination buffer
Clean up todo-list

Functionality implemented. Notes removed.