Minor tweaks

This is a bit of a miscellaneous bunch of patches.  Please let me know if you'd like me to split it up a bit.

Aside from some dealing with valgrind/gcc warnings, the patches allow passwdfd and redial to work together, and allow the user to reclaim their ipparam if they don't need to know the L2TP peer address in their ppp scripts.

Thanks!
-Ted