windows build, remove some warnings

throttle k8s (draios#699)

* throttle max bytes per socket/cycle to 512k, max msgs for critical k8s entities to 100

* ifdef k8s caching

* adjust some commented (TBD) code

* fix the message limit logic

Fix typo in csysdig threads view

Fix ipv4 mapped ipv6 when used on sendto and receiver endpoint is 0

Fix tracer code errors

Fix compilation issues with kernel 4.9 (draios#684)

* Fix compilation issues with kernel 4.9

related commits:
torvalds/linux@4c737b4
torvalds/linux@b9d989c

* map io cgroup to blkio, fix for kernels >= 4.8

Remove spurious directory from CMake

Remove spurious directory from CMake

Use main_thread for set_cwd/get_cwd

Add less to docker image