wsshd: fixup: execute correct command in case 'run' provided

Probably typo, the content of parameter should be executed.

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
client: expose run command

run argument is already supported but not exposed at client side. Enable
this great feature.

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Merge pull request #13 from alonbl/command

Fixup and expose command usage