provision: Add postgres versions for Debian stretch.
provision: Add postgres versions for Debian stretch.

vaidap/zulip,dhcrzf/zulip,jackrzhang/zulip,showell/zulip,jackrzhang/zulip,vabs22/zulip,punchagan/zulip,Galexrt/zulip,shubhamdhama/zulip,showell/zulip,rishig/zulip,andersk/zulip,zulip/zulip,timabbott/zulip,brainwane/zulip,Galexrt/zulip,verma-varsha/zulip,tommyip/zulip,hackerkid/zulip,andersk/zulip,brainwane/zulip,showell/zulip,jackrzhang/zulip,zulip/zulip,dhcrzf/zulip,timabbott/zulip,Galexrt/zulip,rishig/zulip,dhcrzf/zulip,vabs22/zulip,amanharitsh123/zulip,brockwhittaker/zulip,rishig/zulip,rishig/zulip,eeshangarg/zulip,punchagan/zulip,dhcrzf/zulip,synicalsyntax/zulip,vaidap/zulip,showell/zulip,rht/zulip,jackrzhang/zulip,kou/zulip,hackerkid/zulip,brainwane/zulip,Galexrt/zulip,jackrzhang/zulip,rht/zulip,kou/zulip,zulip/zulip,vaidap/zulip,amanharitsh123/zulip,showell/zulip,timabbott/zulip,eeshangarg/zulip,vaidap/zulip,zulip/zulip,synicalsyntax/zulip,punchagan/zulip,verma-varsha/zulip,synicalsyntax/zulip,rht/zulip,shubhamdhama/zulip,eeshangarg/zulip,jackrzhang/zulip,shubhamdhama/zulip,synicalsyntax/zulip,shubhamdhama/zulip,amanharitsh123/zulip,brockwhittaker/zulip,brainwane/zulip,amanharitsh123/zulip,zulip/zulip,dhcrzf/zulip,amanharitsh123/zulip,verma-varsha/zulip,punchagan/zulip,mahim97/zulip,mahim97/zulip,synicalsyntax/zulip,andersk/zulip,showell/zulip,tommyip/zulip,mahim97/zulip,mahim97/zulip,verma-varsha/zulip,timabbott/zulip,mahim97/zulip,hackerkid/zulip,shubhamdhama/zulip,showell/zulip,synicalsyntax/zulip,tommyip/zulip,andersk/zulip,brockwhittaker/zulip,zulip/zulip,kou/zulip,tommyip/zulip,rht/zulip,rht/zulip,punchagan/zulip,vaidap/zulip,brainwane/zulip,hackerkid/zulip,timabbott/zulip,Galexrt/zulip,Galexrt/zulip,vabs22/zulip,hackerkid/zulip,punchagan/zulip,jackrzhang/zulip,vabs22/zulip,tommyip/zulip,mahim97/zulip,synicalsyntax/zulip,brockwhittaker/zulip,rht/zulip,Galexrt/zulip,hackerkid/zulip,vabs22/zulip,verma-varsha/zulip,rishig/zulip,tommyip/zulip,andersk/zulip,punchagan/zulip,eeshangarg/zulip,vaidap/zulip,andersk/zulip,kou/zulip,kou/zulip,eeshangarg/zulip,vabs22/zulip,brockwhittaker/zulip,timabbott/zulip,rishig/zulip,shubhamdhama/zulip,eeshangarg/zulip,rishig/zulip,amanharitsh123/zulip,zulip/zulip,verma-varsha/zulip,dhcrzf/zulip,tommyip/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,dhcrzf/zulip,shubhamdhama/zulip,brockwhittaker/zulip,timabbott/zulip,kou/zulip,hackerkid/zulip,rht/zulip,brainwane/zulip,kou/zulip