webpack: Add ALLOWED_HOSTS list for zulipdev.com and friends.
webpack: Add ALLOWED_HOSTS list for zulipdev.com and friends.

This makes it possible to again use the *.zulipdev.com domains in the
development environment.

Ideally, we'd also read REALM_HOSTS to make this more flexible.

punchagan/zulip,showell/zulip,synicalsyntax/zulip,kou/zulip,rht/zulip,rishig/zulip,timabbott/zulip,kou/zulip,rht/zulip,shubhamdhama/zulip,dhcrzf/zulip,timabbott/zulip,timabbott/zulip,brainwane/zulip,dhcrzf/zulip,hackerkid/zulip,brainwane/zulip,rishig/zulip,timabbott/zulip,zulip/zulip,andersk/zulip,andersk/zulip,dhcrzf/zulip,eeshangarg/zulip,brainwane/zulip,zulip/zulip,jackrzhang/zulip,brainwane/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,tommyip/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,tommyip/zulip,dhcrzf/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,synicalsyntax/zulip,hackerkid/zulip,showell/zulip,andersk/zulip,rht/zulip,punchagan/zulip,rht/zulip,dhcrzf/zulip,synicalsyntax/zulip,kou/zulip,dhcrzf/zulip,shubhamdhama/zulip,timabbott/zulip,dhcrzf/zulip,synicalsyntax/zulip,timabbott/zulip,zulip/zulip,brainwane/zulip,rishig/zulip,showell/zulip,showell/zulip,jackrzhang/zulip,tommyip/zulip,rht/zulip,jackrzhang/zulip,jackrzhang/zulip,brainwane/zulip,shubhamdhama/zulip,jackrzhang/zulip,timabbott/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,andersk/zulip,andersk/zulip,showell/zulip,rht/zulip,zulip/zulip,shubhamdhama/zulip,showell/zulip,zulip/zulip,rishig/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,tommyip/zulip,rishig/zulip,synicalsyntax/zulip,punchagan/zulip,hackerkid/zulip,synicalsyntax/zulip,jackrzhang/zulip,eeshangarg/zulip,rishig/zulip,shubhamdhama/zulip,kou/zulip,punchagan/zulip,synicalsyntax/zulip,punchagan/zulip,eeshangarg/zulip,jackrzhang/zulip,tommyip/zulip,brainwane/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,rishig/zulip,tommyip/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,tommyip/zulip