Add BSD fallback for syspaths.CONFIG_DIR (2014.1 branch)

**Note: as this bugfix spans two separate pull reqs against develop, I am submitting them together as a pull req against 2014.1 to ensure they are merged to 2014.1 together.**

In the absence of _syspaths.py, make sure that the BSDs still look for
configuration files in /usr/local/etc/salt.