Changelog
* Limit thread to 10 due to urllib3 limitations
* Fix multithread pull
* Removed duplicated code on list chunks
* Docker max_pool_size set to cpu_count
* remove check on default image on starting and add check update for docker_network_plugin
* add check update to docker images
* Moved few stuff from settings + Fix image pull
* fix quotes on mac connect command
* fix machine check update
* add check update to docker images
* fix quotes on mac connect command
* fix machine check update
* add plugin selection for linux platforms
* Fix iptables parsing (for network plugin) + Minor fixes
* Loading bar instead of text when starting/cleaning lab
* Fix to lab.ext interface names greater than 15 chars
* Fix to lclean when trying to clean an external interface without sudo
* Manager code polishing (moved deployment methods in Link/Machine, like undeploy)
* Add setting to enable ipv6