Use inodes in open_audit eBPF program

[vadorovsky]

For now we are using hash maps with strings to specify path prefixes, from which we can (or cannot) access files:

https://github.com/rancher-sandbox/lockc/blob/05a94fae2396fbb1ae737df148f402cd3389018b/lockc/src/bpf/maps.h#L67-L113