Remove unnecessary socketchannelcocketfactory

[PennyAndWang]

@electrum , according to what you said in this PR :#5915 , I remove the unnecessary SocketChannelSocketFactory ,please review ,thx!

[findepi]

@PennyAndWang please rebase the PR on current master, so that there is no "Merge .." commit in https://github.com/prestosql/presto/pull/6002/commits

[PennyAndWang]

@findepi Done !

@PennyAndWang please rebase the PR on current master, so that there is no "Merge .." commit in https://github.com/prestosql/presto/pull/6002/commits

[PennyAndWang]

@electrum could you please help me review ？ thx～～～

[PennyAndWang]

@findepi Hi, this PR has been opened for 4 months, I don’t know whether you could review this PR for me or not . THX

[findepi]

@PennyAndWang i asked @electrum for the review (#6002 (comment)), because he knows this area of code much better.

I don't know much about why have SocketChannelSocketFactory in the first place, but it seems @electrum already said it's ok to remove it in #5915 (comment)
So i think I can proceed with this.

But... i am sorry, but could you please rebase the PR?

[PennyAndWang]

@findepi Done !

@PennyAndWang please rebase the PR on current master, so that there is no "Merge .." commit in https://github.com/prestosql/presto/pull/6002/commits

@findepi ,Hi, sorry to bother you again. I have rebased this PR, I need to continue rebase ？ or I understand something wrong ？ or What am I missing?

[findepi]

Merged as eeed38b.