Expand Tabulate package versions in core

[stefangordon]

In #3313 Tabulate was pinned to 0.7.7. Pinning to this older version creates installation challenges and general irritation for users.

I understand the way the tests are written it is currently helpful to minimize change in this package, but I have verified that TestCoreCLIOutput tests work with all versions between 0.7.7 and 0.8.2 (latest) - so we can at least expand dependencies to that range.

[promptws]

View a preview at https://prompt.ws/r/Azure/azure-cli/5985
This is an experimental preview for @microsoft users.

[derekbekoe]

@stefangordon Can you provide some info on how you are attempting to install the CLI?
I assume pip? A virtual environment could be used to separate the dependencies between your multiple projects.
We can still accept this change but would like to know if it's preventing you from a certain scenario.

[stefangordon]

Hey @derekbekoe -
The immediate issue for me is some work we are doing with http://github.com/capitalone/cloud-custodian to extend it to support Azure. Custodian is a CLI for working with cloud resources too, and we have some neat integration with Azure-cli we are building, but the Tabulate version is a problem for us. It seemed this change to CLI was the best approach since it improves CLI usability as well.

But even in typical use cases, I have several times had to switch into a virtualenv or conda environment to run the Azure CLI due to this package, or at least had to manually resolve the dependency with a pip install tabulate==0.7.7 when a downgrade was necessary.

[derekbekoe]

I've taken a look at the release notes since 0.7.7 and it's mostly bug fixes.
https://bitbucket.org/astanin/python-tabulate