Several beaker-related fixes from #104

[dhollinger]

Addresses #104

[dhollinger]

This superscedes #98 if @cdenneen and @ Odiobill approve

[cdenneen]

Looks good

[cdenneen]

I've marked 4 of 8 completed in #104
Think there is 1 that really can't be fixed but other 2-3 can probably still be fixed here if want to have everything in one. (While we wait for @Odiobill to approve the custom image changes)

[dhollinger]

@cdenneen I'm not sure what the best way to go about setting up the "default" job would look like for beaker. It seems like beaker configs are moving away from that and more to beaker-host-generator instead (at least for Docker jobs). But even then, each user's default job will be potentially unique to them.

Anything we do within this repo should conform to the best practices put forth/expected by Puppetlabs with the ability to be modified as needed by the user. The gitlab-ci.yml, travis.yml, appveyor.yml, etc should all be creating the same jobs as close as possible by default.

[Odiobill]

@cdenneen is there anything else I should do to proceed further?

[cdenneen]

@Odiobill do you agree with @dhollinger change for your custom image request? #98

[Odiobill]

I do agree!

[cdenneen]

Looks like we are good to proceed!

[cdenneen]

CC @DavidS

[bmjen]

CC @npwalker @jarretlavallee

These changes LGTM, but I was hoping you'd take a look to see if any of these gitlab changes would impact you.

[npwalker]

A cursory review looks good.