net: added a few new statistics counters to if_data

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
net: make all statistics to be collected all the time

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
ifconfig: fix the interface enumeration function

Fixes issue #470

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
httpserver: Added new statistics counters to ifconfig interface

- ifi_ibh_wakeups;    /* number times Rx BH has been woken up */
- ifi_oworker_kicks;  /* number of kicks from Tx worker */
- ifi_oworker_wakeups;/* number times Tx worker has been woken up */
- ifi_oworker_packets;/* number of Tx packets handled by a Tx worker */
- ifi_okicks;         /* total number of Tx kicks */

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>