feat(backups/RemoteAdapter#outputStream): make path first param

Similar to `fs/Abstract#outputStream()`.

@xen-orchestra/backups/RemoteAdapter.js

@@ -507,7 +507,7 @@ exports.RemoteAdapter = class RemoteAdapter {
     return backups.sort(compareTimestamp)
   }
 
-  async outputStream(input, path, { checksum = true, validator = noop } = {}) {
+  async outputStream(path, input, { checksum = true, validator = noop } = {}) {
     const handler = this._handler
     input = await input
     const tmpPath = `${dirname(path)}/.${basename(path)}`

@xen-orchestra/backups/_DeltaBackupWriter.js

@@ -173,7 +173,7 @@ exports.DeltaBackupWriter = class DeltaBackupWriter {
             await checkVhd(handler, parentPath)
           }
 
-          await adapter.outputStream(deltaExport.streams[`${id}.vhd`], path, {
+          await adapter.outputStream(path, deltaExport.streams[`${id}.vhd`], {
             // no checksum for VHDs, because they will be invalidated by
             // merges and chainings
             checksum: false,

@xen-orchestra/backups/_FullBackupWriter.js

@@ -67,7 +67,7 @@ exports.FullBackupWriter = class FullBackupWriter {
     }
 
     await Task.run({ name: 'transfer' }, async () => {
-      await adapter.outputStream(stream, dataFilename, {
+      await adapter.outputStream(dataFilename, stream, {
         validator: tmpPath => {
           if (handler._getFilePath !== undefined) {
             return isValidXva(handler._getFilePath('/' + tmpPath))

@xen-orchestra/backups/_PoolMetadataBackup.js

@@ -62,7 +62,7 @@ exports.PoolMetadataBackup = class PoolMetadataBackup {
           },
           async () => {
             // forkStreamUnpipe should be used in a sync way, do not wait for a promise before using it
-            await adapter.outputStream(forkStreamUnpipe(stream), fileName, { checksum: false })
+            await adapter.outputStream(fileName, forkStreamUnpipe(stream), { checksum: false })
             await adapter.handler.outputFile(metaDataFileName, metadata, {
               dirMode: this._config.dirMode,
             })