Prevent srfsh commands run from scripts going into history

[Pasi Kallinen]

srfsh scripts run from eg. cronjob put the commands in the user's .srfsh_history. Commands run via scripts should not do that.

Setting HISTSIZE=0 in crontab has no effect.

[Galen Charlton (gmc)]

A patch is available at the tip of the user/gmcharlt/lp1152272_keep_batch_srfsh_out_of_history branch in the working/OpenSRF repository:

http://git.evergreen-ils.org/?p=working/OpenSRF.git;a=shortlog;h=refs/heads/user/gmcharlt/lp1152272_keep_batch_srfsh_out_of_history

Test plan:

    [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

[Mike Rylander (mrylander)]

Picked to master and 2.4 with signoff and thanks.