Support ls about mirrord HOT 6 OPEN

Ah yes, I checked ls on linux after #2003
It worked :)

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@MartinEmrich files under /etc/ are read locally by default. In order to make mirrord read that file remotely even though it is in /etc/, you can add the file's path to the feature.fs.read_only configuration value, or to feature.fs.read_write, if you also want to write to that file. Feel free to come to our discord for live support.

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@t4lz Thanks, that did the trick, it works!

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openat was fixed in #151, detours for ls still pending but low priority

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Maybe we should recheck some of the use-cases after #2003. Maybe more stuff works now?

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Should this also include newfstatat()? I run a java application via mirrord, and it cannot find a file that's present remotely (via a configmap mount).

Running within strace, I see this attempt to access that path:

[pid 18182] newfstatat(AT_FDCWD, "/etc/xxx/yyy", 0x7f985ce7fd20, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)

In Java, I use java.nio.file.Files walk() method at that point.

#2001 also mentions that Java class, but I have no segfault, and run 3.72.0 which is said to containt that fix.

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