aiaiai: change dispatcher hook to email hook

aiaiai: change dispatcher hook to email hook

This patch modifies the current dispatcher hook to the new model of hook
(reading hook contents from stdout of hook). In addition, it also moves
the hook into aiaiai-email-test-patchset instead of putting it in the
dispatcher-helper. This helps simplify the hook process overall.

Amended by Artem.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>