Slightly improve "cleanup".
Slightly improve "cleanup".

- Use docker ps to filter containers by status to avoid building
  such a long pipe.

vkurup/dokku,tilgovi/dokku,jimjag/dokku,akatrevorjay/dokku,crisward/dokku,jamesmarva/dokku,omeid/dokku,progrium/dokku,vlipco/dokku,johnfraney/dokku,pmvieira/dokku,alexquick/dokku,kennetham/dokku,expa/dokku,henrik/dokku,Git-Host/dokku,sebastianscatularo/dokku,mrluc/dokku,basicer/dokku,experimental-platform/dokku,Cactusbone/dokku,econya/dokku,jimeh/dokku,omeid/dokku,eljojo/dokku,Fab-IT-ApS/dokku,u2mejc/dokku,Cactusbone/dokku,matto1990/dokku,elia/dokku,Fab-IT-ApS/dokku,3onyc/dokku,alessio/dokku,vijayviji/dokku,ertrzyiks/dokku,elia/dokku,sseemayer/dokku,cjblomqvist/dokku,mouserage/dokku,jamesmarva/dokku,emdantrim/dokku,amaltson/dokku,callahad/dokku,Git-Host/dokku,Evlos/dokku,mouserage/dokku,crisward/dokku,biddyweb/dokku,pmvieira/dokku,gianpaj/dokku,u2mejc/dokku,mouserage/dokku,kennetham/dokku,3onyc/dokku,arthurschreiber/dokku,rocLv/dokku,crisward/dokku,callahad/dokku,gianpaj/dokku,vijayviji/dokku,suxor42/dokku,mouserage/dokku,Cactusbone/dokku,davidsiefert/dokku,AnselZhangGit/dokku,basicer/dokku,ddreaml/dokku,vlipco/dokku,beedesk/dokku,omeid/dokku,ddreaml/dokku,sseemayer/dokku,dokku/dokku,codeconfab/dokku,emdantrim/dokku,AnselZhangGit/dokku,vkurup/dokku,rocLv/dokku,codeconfab/dokku,jimeh/dokku,bobvanderlinden/dokku,alexquick/dokku,lmars/dokku,sebastianscatularo/dokku,jimeh/dokku,davidsiefert/dokku,u2mejc/dokku,u2mejc/dokku,biddyweb/dokku,crisward/dokku,biddyweb/dokku,lmars/dokku,mouserage/dokku,mmerickel/dokku,arsthanea/dokku,u2mejc/dokku,dokku/dokku,elia/dokku,claytonbrown/dokku,dokku/dokku,barseghyanartur/dokku,sebastianscatularo/dokku,sseemayer/dokku,jazzzz/dokku,codeconfab/dokku,bkniffler/dokku,jamesmarva/dokku,eljojo/dokku,beedesk/dokku,alessio/dokku,bkniffler/dokku,Cactusbone/dokku,experimental-platform/dokku,alessio/dokku,barseghyanartur/dokku,experimental-platform/dokku,jimjag/dokku,suxor42/dokku,bkniffler/dokku,bobvanderlinden/dokku,elia/dokku,netbrick/dokku,omeid/dokku,arsthanea/dokku,TribeMedia/dokku,biddyweb/dokku,akatrevorjay/dokku,fruitl00p/dokku,netbrick/dokku,elia/dokku,cjblomqvist/dokku,fruitl00p/dokku,arthurschreiber/dokku,kennetham/dokku,callahad/dokku,mrluc/dokku,kennetham/dokku,mouserage/dokku,biddyweb/dokku,eljojo/dokku,johnfraney/dokku,matto1990/dokku,dokku/dokku,vlipco/dokku,stepri/dokku,klodoo/dokku,emdantrim/dokku,rocLv/dokku,AnselZhangGit/dokku,mmerickel/dokku,eljojo/dokku,stepri/dokku,Evlos/dokku,vlipco/dokku,Fab-IT-ApS/dokku,3onyc/dokku,Evlos/dokku,kennetham/dokku,pmvieira/dokku,davidsiefert/dokku,alexquick/dokku,lmars/dokku,cjblomqvist/dokku,bobvanderlinden/dokku,sebastianscatularo/dokku,suxor42/dokku,netbrick/dokku,experimental-platform/dokku,eljojo/dokku,matto1990/dokku,kennetham/dokku,fruitl00p/dokku,callahad/dokku,crisward/dokku,henrik/dokku,jimeh/dokku,pmvieira/dokku,matto1990/dokku,emdantrim/dokku,TribeMedia/dokku,callahad/dokku,amaltson/dokku,barseghyanartur/dokku,basicer/dokku,expa/dokku,lmars/dokku,bobvanderlinden/dokku,ddreaml/dokku,omeid/dokku,bkniffler/dokku,progrium/dokku,lmars/dokku,ebeigarts/dokku,beedesk/dokku,klodoo/dokku,Evlos/dokku,jamesmarva/dokku,gianpaj/dokku,vijayviji/dokku,vkurup/dokku,Git-Host/dokku,davidsiefert/dokku,suxor42/dokku,fmoliveira/dokku,beedesk/dokku,jimjag/dokku,elia/dokku,TribeMedia/dokku,jimjag/dokku,akatrevorjay/dokku,crisward/dokku,alexquick/dokku,Evlos/dokku,netbrick/dokku,sseemayer/dokku,barseghyanartur/dokku,codeconfab/dokku,davidsiefert/dokku,tilgovi/dokku,arthurschreiber/dokku,AnselZhangGit/dokku,pmvieira/dokku,TribeMedia/dokku,klodoo/dokku,akatrevorjay/dokku,AnselZhangGit/dokku,progrium/dokku,mrluc/dokku,Evlos/dokku,crisward/dokku,johnfraney/dokku,jamesmarva/dokku,sseemayer/dokku,ddreaml/dokku,amaltson/dokku,alexquick/dokku,klodoo/dokku,eljojo/dokku,matto1990/dokku,klodoo/dokku,jimeh/dokku,AnselZhangGit/dokku,mmerickel/dokku,bobvanderlinden/dokku,dokku/dokku,econya/dokku,econya/dokku,progrium/dokku,beedesk/dokku,TribeMedia/dokku,fmoliveira/dokku,econya/dokku,experimental-platform/dokku,jimeh/dokku,mmerickel/dokku,cjblomqvist/dokku,mmerickel/dokku,barseghyanartur/dokku,callahad/dokku,Git-Host/dokku,mmerickel/dokku,henrik/dokku,basicer/dokku,claytonbrown/dokku,rocLv/dokku,vijayviji/dokku,crisward/dokku,pmvieira/dokku,mrluc/dokku,paralin/crew,dokku/dokku,TribeMedia/dokku,3onyc/dokku,vijayviji/dokku,gianpaj/dokku,omeid/dokku,sebastianscatularo/dokku,experimental-platform/dokku,ertrzyiks/dokku,Git-Host/dokku,johnfraney/dokku,Fab-IT-ApS/dokku,3onyc/dokku,cjblomqvist/dokku,ddreaml/dokku,beedesk/dokku,alessio/dokku,u2mejc/dokku,ertrzyiks/dokku,matto1990/dokku,bkniffler/dokku,alessio/dokku,rocLv/dokku,gianpaj/dokku,Evlos/dokku,Git-Host/dokku,vijayviji/dokku,suxor42/dokku,jazzzz/dokku,fmoliveira/dokku,jamesmarva/dokku,expa/dokku,stepri/dokku,expa/dokku,rocLv/dokku,codeconfab/dokku,netbrick/dokku,vlipco/dokku,eljojo/dokku,jimeh/dokku,vlipco/dokku,AnselZhangGit/dokku,Evlos/dokku,bkniffler/dokku,henrik/dokku,vkurup/dokku,eljojo/dokku,davidsiefert/dokku,basicer/dokku,jazzzz/dokku,tilgovi/dokku,cjblomqvist/dokku,u2mejc/dokku,arsthanea/dokku,mrluc/dokku,3onyc/dokku,tilgovi/dokku,arthurschreiber/dokku,biddyweb/dokku,arthurschreiber/dokku,amaltson/dokku,ebeigarts/dokku,biddyweb/dokku,netbrick/dokku,johnfraney/dokku,arthurschreiber/dokku,mrluc/dokku,Cactusbone/dokku,jamesmarva/dokku,vkurup/dokku,u2mejc/dokku,jazzzz/dokku,bobvanderlinden/dokku,codeconfab/dokku,omeid/dokku,mrluc/dokku,lmars/dokku,sebastianscatularo/dokku,netbrick/dokku,fruitl00p/dokku,claytonbrown/dokku,lmars/dokku,emdantrim/dokku,rocLv/dokku,arsthanea/dokku,experimental-platform/dokku,johnfraney/dokku,suxor42/dokku,rocLv/dokku,claytonbrown/dokku,TribeMedia/dokku,sebastianscatularo/dokku,henrik/dokku,codeconfab/dokku,basicer/dokku,henrik/dokku,arsthanea/dokku,lmars/dokku,arthurschreiber/dokku,expa/dokku,vkurup/dokku,cjblomqvist/dokku,progrium/dokku,ebeigarts/dokku,fruitl00p/dokku,stepri/dokku,Cactusbone/dokku,akatrevorjay/dokku,bkniffler/dokku,ddreaml/dokku,matto1990/dokku,klodoo/dokku,bobvanderlinden/dokku,vkurup/dokku,progrium/dokku,tilgovi/dokku,johnfraney/dokku,fruitl00p/dokku,alessio/dokku,fmoliveira/dokku,AnselZhangGit/dokku,matto1990/dokku,econya/dokku,davidsiefert/dokku,expa/dokku,stepri/dokku,progrium/dokku,arthurschreiber/dokku,sseemayer/dokku,jimjag/dokku,beedesk/dokku,alexquick/dokku,dokku/dokku,mrluc/dokku,jazzzz/dokku,fruitl00p/dokku,akatrevorjay/dokku,ebeigarts/dokku,basicer/dokku,stepri/dokku,davidsiefert/dokku,jazzzz/dokku,henrik/dokku,mmerickel/dokku,emdantrim/dokku,ddreaml/dokku,jimeh/dokku,amaltson/dokku,3onyc/dokku,mouserage/dokku,claytonbrown/dokku,bkniffler/dokku,cjblomqvist/dokku,tilgovi/dokku,ebeigarts/dokku,vlipco/dokku,mouserage/dokku,barseghyanartur/dokku,vijayviji/dokku,claytonbrown/dokku,3onyc/dokku,tilgovi/dokku,jazzzz/dokku,ebeigarts/dokku,expa/dokku,alexquick/dokku,dokku/dokku,ertrzyiks/dokku,akatrevorjay/dokku,jimjag/dokku,expa/dokku,amaltson/dokku,ertrzyiks/dokku,Git-Host/dokku,econya/dokku,netbrick/dokku,basicer/dokku,paralin/crew,Fab-IT-ApS/dokku,sseemayer/dokku,amaltson/dokku,akatrevorjay/dokku,ddreaml/dokku,pmvieira/dokku,barseghyanartur/dokku,Cactusbone/dokku,sseemayer/dokku,Git-Host/dokku,gianpaj/dokku,jimjag/dokku,alessio/dokku,omeid/dokku,alexquick/dokku,ertrzyiks/dokku,kennetham/dokku,henrik/dokku,beedesk/dokku,callahad/dokku,econya/dokku,johnfraney/dokku,Fab-IT-ApS/dokku,ebeigarts/dokku,emdantrim/dokku,klodoo/dokku,ertrzyiks/dokku,fmoliveira/dokku,suxor42/dokku,gianpaj/dokku,experimental-platform/dokku,biddyweb/dokku,fmoliveira/dokku,ertrzyiks/dokku,fmoliveira/dokku,jimjag/dokku,amaltson/dokku,klodoo/dokku,tilgovi/dokku,vlipco/dokku,claytonbrown/dokku,barseghyanartur/dokku,callahad/dokku,arsthanea/dokku,kennetham/dokku,TribeMedia/dokku,fruitl00p/dokku,pmvieira/dokku,arsthanea/dokku,econya/dokku,Cactusbone/dokku,emdantrim/dokku,elia/dokku,claytonbrown/dokku,arsthanea/dokku,gianpaj/dokku,suxor42/dokku,elia/dokku,jamesmarva/dokku,mmerickel/dokku,alessio/dokku,stepri/dokku,ebeigarts/dokku,vijayviji/dokku,progrium/dokku,jazzzz/dokku,bobvanderlinden/dokku,Fab-IT-ApS/dokku,codeconfab/dokku,sebastianscatularo/dokku,stepri/dokku,vkurup/dokku,fmoliveira/dokku,Fab-IT-ApS/dokku