LP#1152272: do not log batch invocation of srfsh in .srfsh_history

LP#1152272: do not log batch invocation of srfsh in .srfsh_history

When running srfsh to process a script, do not log
the requests in .srfsh_history.

To test
-------
[1] Run the following command:

    echo 'request opensrf.math opensrf.system.echo "foo"' | srfsh

[2] Note that the last line of ~/.srfsh_history should be
    'request opensrf.math opensrf.system.echo "foo"'

[3] Apply the patch, compile, and run

    echo 'request opensrf.math opensrf.system.echo "bar"' | srfsh

[4] This time, no additional line should have been added to
    ~/.srfsh_history

[5] Another variation to try:

    srfsh test.srfsh

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