Gazelle: Update to 0.17.0 (#2603)
Gazelle: Update to 0.17.0 (#2603)

We use gazelle diff mode to ensure consistency during lint.
Diff returns an non-zero exit code starting from commit
https://github.com/bazelbuild/bazel-gazelle/commit/386774d
Which is included starting from pre-release 0.17.0
netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,netsec-ethz/scion,Oncilla/scion,Oncilla/scion