Add ha

Add HA documentation including state-server ha, availability zones, availability sets.
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On 14-06-30 03:36 PM, Matt Bruzek wrote:
>> +Whether an environment will use availability sets is determined
>> at bootstrap +time, and cannot be changed afterwards.  In Juju
>> 1.20 and later, new Azure
> 
> ... cannot be changed for the duration of the environment (?)

That's right.  Is "cannot be changed afterwards" unclear?

Aaron
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