EDS 3.8 deprecates e_book_client_new() and replaces it with various
e_book_client_connect() functions. This patch follows the change
and enables direct read access for the addressbook. That means
instead of receiving contacts via the D-Bus session bus, the
connectivity driver now directly accesses the underlaying SQLite
data base (for reading).

This patch also shuffles code in EApiInit() slightly to avoid
excessive if/else nesting.

Change-Id: If41fb92eed2ea26bbf2d3125a9ba2250f142c5a2