Add slot support for all az functionapp commands

[ahmedelnably]

Add slot support for all az functionapp commands

[abforman]

I hit the same problem. We zip deploy all our webapps using using the slot flag, but when I went to deploy our functionapps, that flag wasn't available (az functionapp deployment source config-zip -s SLOTNAME ...)
This is preventing us from using function app slots until support is added!

[sebnyberg]

Running into the same problem here. Slots are more or less useless before it's possible to deploy to them using our CI tool.

[abforman]

I've had confirmation from Microsoft that slot support is GA for function apps.
If the CLI won't add support, what is the alternative? ditch az functionapp and just use az webapp?

[ahmedelnably]

@ph0rman unfortunately until we get the support for slots, az webapp is the only way.
We will be working on increasing the support in az functionapp in CY19, stay posted

[ahmedelnably]

cc: @dariagrigoriu

This should involve adding --slot flag to all commands, in addition we should allow the creation of a slot
New commands: az functionapp deployment slot (create/delete/list/swap)

[ankitkumarr]

@ahmedelnably, please add Sprint 63 milestone to this, I do not have the right permissions.