Remove ugly hacks from Azure test

[mihaitodor]

The time parsing bug has been fixed in Azurite (that was fast!), so the next release should allow us to drop this ugly hack. I'll make this change once they push a new release.

Unfortunately, we still need to hack the host on each request if we want to use a random port for Azurite instead of letting it start on port 10000, which might clash with other things.

[Jeffail]

Awesome, thanks @mihaitodor for raising that issue and for the follow up.

[mihaitodor]

Before I can enable this test, there are a couple more bugs which need to be fixed:

• AppendBlock from azure-sdk-for-go v50.1.0 doesn't work Azure/Azurite#682 - Released in 3.11.0
• azure-sdk-for-go AppendBlock operation resolves to AppendBlobHandler.create() Azure/Azurite#702 - I fear this might not get fixed anytime soon...

[mihaitodor]

Fixed in #1901