Bump alpine 3.9.0 to 3.9.2
Fixes #495
Alpine 3.9.2 was released today (3/4/19). I looked at some previous commits that did a similar version bump, but I wasn't sure if this is all that needed to be done (or if we need to wait for something else) or if there is more necessary. Wanted to take a stab at it but it's my first commit here and wasn't sure the exact procedures/testing processes.
@tianon @gliderbot can we get some feedback on this bump? before we have to make it a 3.9.3 bump? :)
The actual artifacts for the alpine official image have moved over to https://github.com/alpinelinux/docker-alpine, and looking at https://github.com/alpinelinux/docker-alpine/blob/v3.9/VERSION, it already has this bump (as can be seen by the availability of the alpine:3.9.2 tag, which is also new with the introduction of that repository).
So I take it all the open PR's here are probably then just going to go stale/closed? Also that would mean that the docker hub needs some updating?
latest Alpine 3.9 is now 3.9.4!
In test directory, tests about 3.6, 3.7 and 3.8 have same problem in this PR. It is the reason why CircleCI in my PR #503 is failed.