loopd: alias server rpc import with looprpc

Packages importing loopd can't import 2x looprpc packages (in the
form of swapserverrpc and looprpc). To get around this, we alias
each import with a different name, updating the server in this
commit.

loopd/swapclient_server.go

@@ -19,7 +19,7 @@ import (
 	"github.com/lightninglabs/loop/loopdb"
 	clientrpc "github.com/lightninglabs/loop/looprpc"
 	"github.com/lightninglabs/loop/swap"
-	"github.com/lightninglabs/loop/swapserverrpc"
+	looprpc "github.com/lightninglabs/loop/swapserverrpc"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 	"github.com/lightningnetwork/lnd/lnwire"
@@ -526,7 +526,7 @@ func (s *swapClientServer) GetLoopInQuote(ctx context.Context,
 }
 
 // unmarshallRouteHints unmarshalls a list of route hints.
-func unmarshallRouteHints(rpcRouteHints []*swapserverrpc.RouteHint) (
+func unmarshallRouteHints(rpcRouteHints []*looprpc.RouteHint) (
 	[][]zpay32.HopHint, error) {
 
 	routeHints := make([][]zpay32.HopHint, 0, len(rpcRouteHints))
@@ -549,7 +549,7 @@ func unmarshallRouteHints(rpcRouteHints []*swapserverrpc.RouteHint) (
 }
 
 // unmarshallHopHint unmarshalls a single hop hint.
-func unmarshallHopHint(rpcHint *swapserverrpc.HopHint) (zpay32.HopHint, error) {
+func unmarshallHopHint(rpcHint *looprpc.HopHint) (zpay32.HopHint, error) {
 	pubBytes, err := hex.DecodeString(rpcHint.NodeId)
 	if err != nil {
 		return zpay32.HopHint{}, err