[#59] Fix msreplic_E/instance_file_backup_stress subtest failure (leftover ftok sem of sec_*.repl files on instance2) that started happening only after V6.3-003 code merge; Most likely the leftover ftok sem was being cleaned up unintentionally in later steps of the test by V6.3-002
[#59] Fix msreplic_E/instance_file_backup_stress subtest failure (leftover ftok sem of sec_*.repl files on instance2) that started happening only after V6.3-003 code merge; Most likely the leftover ftok sem was being cleaned up unintentionally in later steps of the test by V6.3-002

nars1/YottaDBtest,nars1/YottaDBtest,nars1/YottaDBtest,nars1/YottaDBtest,nars1/YottaDBtest,nars1/YottaDBtest