push via sftp issue when file parent directory does not exist

Overcomes exception Net::SFTP::StatusException (2, "no such file") when using: "vagrant push" via sftp and a file parent directory does not exist. Function "upload" does not create the directory before uploading a file ('mkdir: true' seems to have no effect as zero directories are created while files are uploaded normally).

plugins/pushes/ftp/adapter.rb

@@ -106,6 +106,7 @@ module VagrantPlugins
       def initialize(*)
         require "net/sftp"
         super
+        @dirs = []
       end
 
       def default_port
@@ -120,7 +121,21 @@ module VagrantPlugins
       end
 
       def upload(local, remote)
-        @server.upload!(local, remote, mkdir: true)
+        dir = File.dirname(remote)
+
+        fullpath = Pathname.new(dir)
+        fullpath.descend do |path|
+          if !@dirs.include?(path.to_s)
+            @dirs.push(path.to_s) # Cache visited directories in a list to avoid duplicate requests
+            begin
+              @server.mkdir!(path.to_s)
+            rescue Net::SFTP::StatusException => e
+              # Directory exists, skip...
+            end
+          end
+        end
+        
+        @server.upload!(local, remote)
       end
     end
   end