add missing postgresql93-contrib module and add postgresql initdb and start also remove uneeded redis socket path line for debian / ubuntu
add missing postgresql93-contrib module and add postgresql initdb and start
also remove uneeded redis socket path line for debian / ubuntu

t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq