Issue title: No scp/sftp with Dropbear. Safe to use OpenSSH instead?
 Issue body: (Obviously not both at the same time).
Or is there a way to get scp/sftp with Dropbear?
 Comments: 
 Comment 0: ```
cat iosbinpack64/usr/bin/scp | ssh root@iphone "cat > remote"
ssh root@iphone
mv remove /usr/bin/scp
```
Then you have scp
 Comment 1: Thanks.
Still wondering if there's anything inherently wrong with using OpenSSH with this jailbreak though.
 Comment 2: 10.2 Comple Guide Video
https://www.youtube.com/watch?v=OyG18xtcRUI
 Comment 3: Thanks but I have scp now.

A lot of (most?) developers are going to want scp/sftp, it would be preferable to be able to install OpenSSH via Cydia for one-step ssh+scp+sftp. Is there an incompatibility with yalu that's forcing Luca to install dropbear?
 Comment 4: Maybe something that would try to launch at startup, causing problems as it's not jailbroken at startup until Yalu is launched
 Comment 5: Yalu reloads launch daemons after jailbreaking, so I don't fink that's the issue.
 Comment 6: But what if a daemon containing unsigned code tries to launch at startup before Yalu is launched ?
 Comment 7: It fails to load until Yalu tries reloading it after jailbreaking (via the reload script in the source files)
 Comment 8: openssh is not compatible with iOS 10
 Comment 9: That's the problem then :) thank you for the clarification.
 Comment 10: this `sftp-server` will work if copied to `/usr/libexec/sftp-server` https://github.com/dweinstein/openssh-ios/releases
 Comment 11: Your sftp-server code works like a charm dweinstein !! I had to create a fee github account just to say a big thanks! Much appreciated! God Bless!!
Perry
 Comment 12: You're welcome! :-)
 Comment 13: Using iFunbox to drag you file into the directory which you want to store.
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