mlaunch: ignore processes which don't have --port
mlaunch: ignore processes which don't have --port

Fixes #297.

ces0712/mtools,tomzhang/mtools,parkhyeonghwa/mtools,gormanb/mtools,yaowenqiang/mtools,devkev/mtools,devkev/mtools,aerrami/mtools,ces0712/mtools,rueckstiess/mtools,parkhyeonghwa/mtools,parkhyeonghwa/mtools,aerrami/mtools,tomzhang/mtools,aerrami/mtools,devkev/mtools,tomzhang/mtools,yaowenqiang/mtools,gormanb/mtools,ces0712/mtools,yaowenqiang/mtools,rueckstiess/mtools,gormanb/mtools