nfdump get only ips from given network

- nfdump get only ips from given network
- logging -> logger
Fix network plugin
Added venture name to symbol
Fix tests

- Fix test when venture is none
- Fix test when there is not IP
cast is_blade to bool
usage type average usage
merge
add overwriting to usages api
Merge pull request #156 from mkurek/feature/collect-api-overwrite

add overwriting to usages api
Merge pull request #155 from mkurek/fix/assets-collect-is-blade

cast is_blade to bool
Merge pull request #154 from mkurek/feature/usage-average

usage average
Remove needless iterations

- Remove needless iterations
Merge pull request #148 from kula1922/hotfix/network

nfdump get only ips from given network