Missing VFS lib when building

[jeremyhahn]

Dragonboat version

v3.3.4

Expected behavior

Able to run go get

Actual behavior

Running go get produces the following error:
go: finding module for package github.com/lni/goutils/vfs
go: github.com/myrepo/myproject/cluster imports
github.com/lni/dragonboat/v3 imports
github.com/lni/dragonboat/v3/internal/logdb imports
github.com/lni/goutils/vfs: module github.com/lni/goutils@latest found (v1.4.0), but does not contain package github.com/lni/goutils/vfs

Steps to reproduce the behavior

Empty go.mod and run go get

[kevburnsjr]

I also noticed this while attempting to build old versions of dragonboat-example to compare historical performance.

I never understood why it was happening though, because dragonboat 3.3.* is supposed to be pinned to goutils v1.3.0
https://github.com/lni/dragonboat/blob/v3.3.4/go.mod#L10

[jeremyhahn]

I believe the root issue is that Dragonboat is using an old version of Pebble, and the solution is to support the latest version.