Check_MK Werk 7177: Fix background job warning "IOError: [Errno 9] Bad file descriptor"

ID: 7177 Title: Fix background job warning "IOError: [Errno 9] Bad file descriptor" Component: WATO Level: 1 Class: Bug fix Version: 1.6.0i1 When starting a background job an unproblematic error message like this could occur in the output of the background job log: <code> sys.stdin.close() IOError: [Errno 9] Bad file descriptor </code> This was caused by an unclean stdin/stdout/stderr handling during job startup since commit b15dfeb619c14c925b66f2a3437d213852204975.