Bucket watch_port and watch_group defaults

[pgcrooks]

The default values for watch_port and watch_group in the Bucket class are both 0. However, according to the OF 1.3.4 standard these should be set to OFPP_ANY and OFPG_ANY if they are to be ignored. I believe port 0 is invalid, whereas group 0 can be a valid ID.

[pgcrooks]

This is seen in both:

src/python/loxi/of13/common.py src/python/loxi/of14/common.py