LP#1461625: ensure srfsh doesn't close STDOUT prematurely

LP#1461625: ensure srfsh doesn't close STDOUT prematurely

Ensure that when running srfsh in non-interactive mode
that reads commands directly from a file, (i.e.,
"srfsh script.srfsh" or as a shebang script), it does
not close STDOUT after handling the first request.

To test
-------
[1] Create a srfsh script containing:

    request opensrf.math opensrf.system.echo "foo"
    request opensrf.math opensrf.system.echo "bar"

[2] Run "srfsh script.srfsh". Note that only the
    results of the first echo request are output.
[3] Apply the patch and recompile, then run
    "srfsh script.srfsh" again.  This time, the
    output of both requests is displayed.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>