remove process.exit() from loadgen upon email addition failure. loadgen...

remove process.exit() from loadgen upon email addition failure.  loadgen shouldn't stop till it reaches the top.

lib/load_gen/activities/add_email.js

@@ -114,7 +114,6 @@ exports.startFunc = function(cfg, cb) {
           } catch (e) {
             var err = 'failed to complete email addition for: ' + email + ' (' + token + '): ' + e.toString();
             winston.error(err);
-            process.exit(1);
             return cb(err);
           }