azure: make root_volume_size configurable for aws parity

[lamdor]

The OS image defaults to a 32GiB disk, however, it'd be nice to configure this so we can make it larger.

[justaugustus]

@alexsomesan can you take a peep at this?
We've got a customer asking for this as well.

[mxinden]

We did some changes (#2082) to the testing process. Please rebase on to current master, so that the basic-tests PR status is reported correctly.

[lamdor]

@mxinden @justaugustus @alexsomesan Rebased.

[justaugustus]

@rubbish would you mind rebasing this again and then running make structure-check?
You may also need to run terraform fmt . and make docs examples prior to pushing.

[lamdor]

@justaugustus Done.

[alexsomesan]

Looks good, thanks!

[cpanato]

@rubbish can you please rebase? then I will run the tests. thanks!

[lamdor]

@cpanato Done

[cpanato]

ok to test

[cpanato]

@rubbish can you please run 'make examples' to fix the issues?

outdated examples (run 'make examples' to fix)

Makefile:147: recipe for target 'structure-check' failed

[lamdor]

@cpanato Updated the examples and rebased again.

[cpanato]

@rubbish
some errors from the init phase:

Error getting plugins: 3 problems:


- module "etcd": missing required argument "root_volume_size"

- module "masters": missing required argument "root_volume_size"

- module "workers": missing required argument "root_volume_size"

make: *** [terraform-init] Error 1

[sym3tri]

Thanks for the contribution, but I'm going close this b/c it looks like the same functionality was just merged in #2944.