Don't put ssmtp in hydra's paths

Some installations may want to use system-wide sendmail (i.e. /run/setuid-wrappers/sendmail) and those that want ssmtp can add it to hydra's path themselves.

Signed-off-by: Shea Levy <shea@shealevy.com>

Created by  Shea Levy  on July 28, 2013
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