Epollevents as vector breaks basic functionality

```
commit 17ad0610ef35607b50bfba51c85ac63c062eb731
Author: Simon Gomizelj <sgomizelj@sangoma.com>
Date:   Tue Jun 16 18:44:32 2015 -0400

    Convert epollevents to a vector
```

Example:

```
$ ./sipp -sn uas -m 10 -p 5070
$ ./sipp -m 10 -sn uac 127.0.0.1:5070
```

Yields: 0 received packets in uas.
