Enable demonstration of updates and switching streams

[asamalik]

We need to be able to demonstrate updates whithin a single stream, as well as switching streams. Both need to work without configuring anything.

Both can be demonstrated with the nodejs module. We have two versions of the f26 stream, and on of the 8 stream. The problem is that the Boltron compose contains only one version of the f26 stream...

Switching streams:

This could be done by enabling the fedora-modular-rawhide repo which contains the 8 stream of nodejs. Could we please have that enabled as a default?

Updates whithin a stream:

This one is a bit trickier, but still easily doable. There is an older version of the f26 stream available in a random repo.

My proposal is to enable it and install this version of nodejs into the image itself, so it comes with nodejs pre-installed. User can then just test the update and switching streams.

How I did it:

$ printf '[fedora-modular-2]\nbaseurl=https://ttomecek.fedorapeople.org/modular-nodejs-6-10-2/\ngpgcheck=0\nmodules=1\nenabled=1' > /etc/yum.repos.d/fedora-modular-2.repo

$ dnf install nodejs-f26-20170607065214

It installs nodejs-1:6.10.2 and user can then update to nodejs-1:6.10.3 from the Boltron compose.

[james-antill]

Done and pushed (not tested). But you do have write access now.