Port 5000 can cause problems with Kitematic #9
Description
Kitematic has a hardcode list of 'web ports', and 5000 is on that list:
https://github.com/docker/kitematic/blob/e40ba41f1b2d623636241162df0b44178a685af6/src/utils/Util.js#L215
When you open a container with one of those ports exposed, Kitematic tries to open a Web Preview of the container. Sometimes this causes the unison container to crash.
Since the port 5000 seems arbitrary, perhaps it could be changed to something not in that list?
I looked here: https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers and see that 5000 is the default port of Flask which is probably why it is on the Kitematic list.
How about 5333 instead?
It is not assigned in IANA, and is not listed in the wikipedia list.