corp-ssh-helper-helper: Add proxy-mode and -dst_username

These two arguments are used by the latest ~/.ssh/config for accessing
lab.

Also apply `cros format` which is required by `repo upload`.

BUG=None
TEST=ssh to lab in chroot with latest ~/.ssh/config

Change-Id: Ib7e84325ed701b14ee2d51959d72c40ce66a4b76
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/7035611
Commit-Queue: Cheng Yueh <[email protected]>
Tested-by: Cheng Yueh <[email protected]>
Reviewed-by: Clark Chung <[email protected]>
Reviewed-by: Ryo Hashimoto <[email protected]>
2 files changed