docker: fix startup scripts for nsd and dovecot to run them in the foreground
docker: fix startup scripts for nsd and dovecot to run them in the foreground

Neopallium/mailinabox,jjz/mailinabox,mboersma/mailinabox,b-deng/mailinabox,d5ve/mailinabox,choltha/mailinabox,hnk/mailinabox,b-deng/mailinabox,brocktice/mailinabox,pierreozoux/mailinabox,jprice/mailinabox,mail-in-a-box/mailinabox,pichak/mailinabox,ianberinger/mailinabox,jprice/mailinabox,nstanke/mailinabox,m4rcs/mailinabox,Toilal/mailinabox,m4rcs/mailinabox,b-deng/mailinabox,pierreozoux/mailinabox,pierreozoux/mailinabox,jmedding/mailinabox,jprice/mailinabox,choltha/mailinabox,d5ve/mailinabox,mboersma/mailinabox,PortableTech/mailinabox,hnk/mailinabox,PortableTech/mailinabox,ianberinger/mailinabox,b-deng/mailinabox,nstanke/mailinabox,jmedding/mailinabox,PortableTech/mailinabox,mboersma/mailinabox,ianberinger/mailinabox,pierreozoux/mailinabox,Toilal/mailinabox,choltha/mailinabox,Neopallium/mailinabox,m4rcs/mailinabox,brocktice/mailinabox,pichak/mailinabox,mboersma/mailinabox,choltha/mailinabox,mail-in-a-box/mailinabox,pierreozoux/mailinabox,b-deng/mailinabox,brocktice/mailinabox,Toilal/mailinabox,jjz/mailinabox,pichak/mailinabox,PortableTech/mailinabox,nstanke/mailinabox,Toilal/mailinabox,brocktice/mailinabox,jjz/mailinabox,d5ve/mailinabox,jprice/mailinabox,jmedding/mailinabox,d5ve/mailinabox,m4rcs/mailinabox,brocktice/mailinabox,ianberinger/mailinabox,mail-in-a-box/mailinabox,mboersma/mailinabox,ianberinger/mailinabox,hnk/mailinabox,jmedding/mailinabox,jjz/mailinabox,m4rcs/mailinabox,PortableTech/mailinabox,jjz/mailinabox,mail-in-a-box/mailinabox,nstanke/mailinabox,nstanke/mailinabox,jmedding/mailinabox,d5ve/mailinabox,Neopallium/mailinabox,jprice/mailinabox,Neopallium/mailinabox,pichak/mailinabox,choltha/mailinabox,hnk/mailinabox,Neopallium/mailinabox