[#488] reputation/managers: Implement route builders

Add implementation of Builder interface for
intermediate trusts. Move all code associated
with managers to `common` directory in `cmd`
and `pkg/services/reputation`

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/services/reputation/eigentrust/routes/calls.go

@@ -0,0 +1,23 @@
+package routes
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
+	reputationroute "github.com/nspcc-dev/neofs-node/pkg/services/reputation/common/router"
+	"github.com/pkg/errors"
+)
+
+// NextStage builds Manager list for trusted node and returns it directly.
+//
+// If passed route has more than one point, then endpoint of the route is reached.
+func (b *Builder) NextStage(epoch uint64, t reputation.Trust, passed []reputationroute.ServerInfo) ([]reputationroute.ServerInfo, error) {
+	if len(passed) > 1 {
+		return nil, nil
+	}
+
+	route, err := b.managerBuilder.BuildManagers(epoch, t.Peer())
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not build managers for epoch: %d", epoch)
+	}
+
+	return route, nil
+}