Add a 'which_callbacks' keyword to match(), which limits when the Python callback will be called.

Revert "Add a 'which_callback' keyword to match(), which limits when the python callback will be called."

This reverts commit e2cb4e39.

When iterating over a Rules object, the iteration would work for a
single pass before throwing a StopIteration exception. This slightly
changes the iteration logic to reset to the iteration list head after
a full iteration has been completed.

* Add missing openssl include path.

* Add HAVE_LIBCRYPTO.

Do not build “cuckoo” module in Travis-CI as jansson library in Ubuntu 12.04 is too old. Build “dotnet” module instead.