Revert "AUTH-1941: Adds initial SSH server implementation"

This reverts commit e9c9bf3cbd.

vendor/github.com/creack/pty/pty_linux.go

@@ -1,51 +0,0 @@
-package pty
-
-import (
-	"os"
-	"strconv"
-	"syscall"
-	"unsafe"
-)
-
-func open() (pty, tty *os.File, err error) {
-	p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
-	if err != nil {
-		return nil, nil, err
-	}
-	// In case of error after this point, make sure we close the ptmx fd.
-	defer func() {
-		if err != nil {
-			_ = p.Close() // Best effort.
-		}
-	}()
-
-	sname, err := ptsname(p)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	if err := unlockpt(p); err != nil {
-		return nil, nil, err
-	}
-
-	t, err := os.OpenFile(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
-	if err != nil {
-		return nil, nil, err
-	}
-	return p, t, nil
-}
-
-func ptsname(f *os.File) (string, error) {
-	var n _C_uint
-	err := ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n)))
-	if err != nil {
-		return "", err
-	}
-	return "/dev/pts/" + strconv.Itoa(int(n)), nil
-}
-
-func unlockpt(f *os.File) error {
-	var u _C_int
-	// use TIOCSPTLCK with a pointer to zero to clear the lock
-	return ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
-}