lib: Prefer abandonware i2c

Legacy i2c will be used by IoT.js runtime

Change-Id: Ifc2df3f9567f85d21c121c0bcc129b72e7d3f895
Forwarded: bbx10#3
Relate-to: kelly/node-i2c#97
Signed-off-by: Philippe Coval <rzr@users.sf.net>

index.js

@@ -22,8 +22,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-var i2c = require('i2c');
 var fs=require('fs');
+var i2c = null;
+try {
+    i2c = require('@abandonware/i2c');
+} catch(err) {
+    i2c = require('i2c');
+}
 
 var MAX_TEMP_CONVERSION     = 50;   // milliseconds
 var MAX_HUMI_CONVERSION     = 16;   // ms