- removed extra white spaces in Makefile
- changed license from GPL-3.0 to GPL-3.0-only
- added test.sh

Signed-off-by: Clark Wang <dearvoid@gmail.com>
(cherry picked from commit 580fe568d6)

Sshpass does not work well in a few scenarios. Passh is an sshpass
alternative which tries to fix the issues.

Signed-off-by: Clark Wang <dearvoid@gmail.com>
(cherry picked from commit 1221ceed8d)