IMAPPush.py: Code wasn't using host or ssl options from merlin.cfg. Now it is.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
IMAPPush.py: Removed redundant line.
Signed-off-by: Martin Stone <martin@d7415.co.uk>
!defcall: Added a missing str -> int conversion in robocop().
Signed-off-by: Martin Stone <martin@d7415.co.uk>