Remove most warnings

Signed/unsigned comparison, initialized after, ...
10 jobs for master in 9 minutes and 57 seconds
Status Job ID Name Coverage
  Test
passed #10190
autobatch

00:02:05

passed #10189
batch

00:01:54

passed #10193
dpdk-batch

00:01:57

passed #10194
dpdk-nobatch

00:01:46

passed #10191
ip6

00:02:09

passed #10192
mt

00:02:07

passed #10196
netmap

00:01:37

passed #10197
netmap_nopool

00:02:15

passed #10198
netmap_nopool_nozc

00:02:09

passed #10195
netmap_single

00:01:37