Amongst a huge number of fixes all over the place and the move away from
Travis this release introduces:
* better support for restoring containers into existing pods
* pidfd based pid reuse detection for RPC clients
* allow restoring of precreated veth devices
* license change for all files in the images/ directory to MIT
* criu-ns helper script
* use clang-format for automatic code indentation
* support checkpoint/restore of stacked apparmor profiles
* [GSoC] Add nftables based network locking/unlocking (Zeyad Yasser)
Signed-off-by: Adrian Reber <[email protected]>