refactor(ooniprobe): migrate database to internal (#979)

See https://github.com/ooni/probe/issues/2352

Co-authored-by: decfox <decfox@github.com>
Co-authored-by: Simone Basso <bassosimone@gmail.com>

internal/database/database_test.go

@@ -0,0 +1,32 @@
+package database
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/apex/log"
+)
+
+func TestConnect(t *testing.T) {
+	tmpfile, err := ioutil.TempFile("", "dbtest")
+	if err != nil {
+		t.Error(err)
+	}
+	defer os.Remove(tmpfile.Name())
+
+	sess, err := Connect(tmpfile.Name())
+	if err != nil {
+		t.Error(err)
+	}
+
+	colls, err := sess.Collections()
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(colls) < 1 {
+		log.Fatal("missing tables")
+	}
+
+}