Create resource group if not found

[yugangw-msft]

Contexts:

1. Almost every create command needs to provide a resource group and a few people have expressed the desire that CLI should create it if not existing
2. But to create a group, we need location which is an optional argument

Propose:

1. We can let CLI handle it at base layer, and expose a configuration point like auto-create-group. A user can set it to true, or maybe we default to true
2. For the location parameter needed to create the group, we can handle it:
   a. If the location is supplied at command, use it
   b. Again, we can expose a configuration point of default location and CLI will use that.

/cc: Johan Stenberg (ex-msft) (@johanste), Cole Mickens (@colemickens) , Ralph Squillace (@squillace)

[johanste]

Minor addition; the location would have to be per cloud (different clouds have different locations).

[derekbekoe]

Related to #623?

[tjprescott]

I would close out #623 as this has more thought put into the technical implementation.

[lostintangent]

I couldn't possibly +1 this proposal enough! I'd love to also toss out #1377 into the general conversation, since together, I think they would help simplify the CLI experience quite a bit.

[yugangw-msft]

Johan Stenberg (ex-msft) (@johanste), please triage

[johanste]

Jonathan Carter (@lostintangent), given that resource group create is now goal seeking (i.e. doing a create for an existing resource group will not fail unless you are trying to change its location), do you still feel the need for this check?

The downside is that we have to make extra calls for each create command (to check for existence), which will slow down the command execution.

[JasonRShaver]

Cleaning u old issues, reopen if this is still active.