testing: use strings.SplitSeq and bytes.SplitSeq
To simplify the code. This is a follow-up for the CL 646216.
Change-Id: Ib09d1074a783482fb293527e9f1abeb3c02137c3
GitHub-Last-Rev:
2e7a6ad40cc22ea855e4d703ff39db9cc2c8a58e
GitHub-Pull-Request: golang/go#71568
Reviewed-on: https://go-review.googlesource.com/c/go/+/646755
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Salah (Globlost) <globlost@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Damien Neil <dneil@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>