Testnet-4 v0.4.0.7 installation fails in lxd containers.

[artmakh]

Steps to reproduce:

1. Launch lxd ubuntu containers with enabled nesting and in privileged mode lxc launch ubuntu:lts kiranode -c security.nesting=true -c security.privileged=true
2. Start installation of Kira network as it's mentioned in README
3. Get fail at this setup step sysctl -w fs.inotify.max_user_watches=524288

Explanation
LXD containers, even in privileged mode doesn't provide full sysctl access to kernel. All needed tuning is made on host machine via lxd config, or in host-kernel itself.

Possible fixes
Before modifying kernel config check if desired already parameter have correct value.