fix(target): Encode hyphens as _2d in systemd unit path
fix(target): Encode hyphens as _2d in systemd unit path

This is a partial fix for the bigger problem detailed in issue #13.

giantswarm/fleet,bviswana101/fleet,thepwagner/fleet,bcwaldon/fleet,dalbani/fleet,mookjp/fleet,WPMedia/fleet,mwitkow/fleet,octoblu/fleet,mwitkow/fleet,improbable-io/fleet,ecnahc515/fleet,dongsupark/fleet,hhoover/fleet,giantswarm/fleet,coreos/fleet,mischief/fleet,flandr/fleet,jonboulle/fleet,mwitkow-io/fleet,mwhooker/fleet,ecnahc515/fleet,octoblu/fleet,jonboulle/fleet,endocode/fleet,paveltiunov/fleet,flandr/fleet,hhoover/fleet,dalbani/fleet,improbable-io/fleet,bcwaldon/fleet,endocode/fleet,endocode/fleet,bcwaldon/fleet,WPMedia/fleet,esatterwhite/fleet,giantswarm/fleet,coreos/fleet,dongsupark/fleet,improbable-io/fleet,esatterwhite/fleet,thepwagner/fleet,dalbani/fleet,mischief/fleet,mwitkow-io/fleet,mookjp/fleet,dongsupark/fleet,bviswana101/fleet,jonboulle/fleet,wuqixuan/fleet,webwlsong/fleet,wuqixuan/fleet,coreos/fleet,mwhooker/fleet,paveltiunov/fleet,ecnahc515/fleet,webwlsong/fleet