read() call on directories throws error in Linux
while works in AIX. Disable it and throw EISDIR.
Correct the test case logic which launches remote
process in debug mode, which gets terminated when
SIGUSR1 is issued. V8 launched in debug mode does
not handle SIGUSR1, handle is instaleld only when
started in normal mode. Remove the --debug flag,
and use default port for the connectivity.
Disable this test for AIX as the /dev/stdin is not
available in AIX. Circumventions in node possible,
but as the device name is hard coded in the test
case, that does not look necessary or relevant.