all: move reports/ and excluded/ to data/ directory

Put the database (active and excluded reports) under a common
directory prefix.  This simplifies applying separate licenses to
the code and the database.

Change-Id: Icb2a987b96dca18a8fb064dfd9c6d67d6620e2e3
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/423394
Reviewed-by: Julie Qiu <julieqiu@google.com>

all_test.go

@@ -36,8 +36,8 @@ func TestChecksBash(t *testing.T) {
 }
 
 const (
-	reportsDir  = "reports"
-	excludedDir = "excluded"
+	reportsDir  = "data/reports"
+	excludedDir = "data/excluded"
 )
 
 func TestLintReports(t *testing.T) {

cmd/vulnreport/main.go

@@ -107,7 +107,7 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
-		commitDates, err := gitrepo.AllCommitDates(repo, gitrepo.MainReference, "reports/")
+		commitDates, err := gitrepo.AllCommitDates(repo, gitrepo.MainReference, "data/reports/")
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -174,7 +174,7 @@ func create(ctx context.Context, issueNumber int, ghToken, issueRepo, repoPath s
 	if !iss.CreatedAt.IsZero() {
 		year = iss.CreatedAt.Year()
 	}
-	filename := fmt.Sprintf("reports/GO-%04d-%04d.yaml", year, issueNumber)
+	filename := fmt.Sprintf("data/reports/GO-%04d-%04d.yaml", year, issueNumber)
 	if err := r.Write(filename); err != nil {
 		return err
 	}