delete lint_test.go
delete lint_test.go

TestLintReports lints reports in x/vulndb. It is deleted and will be
kept in x/vulndb.

Change-Id: I29638f19e7dd60a4b7338495e9fc3ad0171c8c9f
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/360439
Trust: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Run-TryBot: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Roland Shoemaker <0d270388f2f92757a5de0f4bd891d3b392c44c4f@golang.org>

golang/vuln,golang/vuln