R1:4c09e88c9582

Add parsing for ssh options (-o) which are passed when using GIT v2 wire protocol by git command (SSH transport)

Summary:
Makes `ssh-connect` compatible with Git v2 wire protocol over SSH

More details about git V2 wire: https://opensource.googleblog.com/2018/05/introducing-git-protocol-version-2.html

`git` command (2.18+) passes extra options (`-o "SendEnv GIT_PROTOCOL"`) to underlying `ssh` command to enable v2 wire protocol (environment variable enabling new protocol).

Phabricator `ssh-connect`…