Migrate more integration tests

[danielmitterdorfer]

With this commit we migrate a few more integration tests from the shell script approach to the new approach based on py.test.

[hub-cap]

yay! one thing i would be fine with is using single quotes in those esrally invocation lines to protect us against any bash substitution. I assume they are all regular strings tho.

Example

"esrally \"$(some foo junk)\" "

vs

"esrally '$(some foo junk)' "

will be evalutated differently on the command line

[hub-cap]

is this something that should be in the .ci folder for externalization, vs in some python code?

[danielmitterdorfer]

I don't think we should put this in .ci as nothing except our integration test code is using this.

[danielmitterdorfer]

Thanks for your review!

one thing i would be fine with is using single quotes in those esrally invocation lines to protect us against any bash substitution.

I think we can address this separately but that's a good point.