Add azurite --loose option

[agjohnson]

I was getting 5xx errors from azurite every other load of a static asset
file. I found this issue and added a fix that was mentioned:
Azure/Azurite#337

I can not reccomend this fix and I did not try to spend any time
understanding Azurite.

[humitos]

You may hit this issue because we are not pinning azurite image (just using latest). My image is from 5 months ago. They may changed something.

We may be sending an invalid HTTP header when proxying to it. --loose mode just disable the strict check on headers, which does not really affects us. So, I suppose we should be fine with this.

After updating my azurite docker image and using this PR, I still have timeout/500 issues:

web_1        | x-ms-client-request-id:fac68bee-5235-11ea-b9d8-02420a0a0007
web_1        | x-ms-date:Tue, 18 Feb 2020 10:04:31 GMT
web_1        | x-ms-range:bytes=0-33554431
web_1        | x-ms-version:2018-03-28
web_1        | /devstoreaccount1/devstoreaccount1/static/staticfiles.json
web_1        | timeout:20
web_1        | [18/Feb/2020 10:04:31] urllib3.connectionpool:266[20]: DEBUG Resetting dropped connection: storage
web_1        | [18/Feb/2020 10:04:31] urllib3.connectionpool:437[20]: DEBUG http://storage:10000 "GET /devstoreaccount1/static/staticfiles.json?timeout=20 HTTP/1.1" 500 0

We may need to take a deeper look at this.

[agjohnson]

Also, to clarify, the --loose option did resolve the problem I was seeing. I'm able to consistently reload the assets now. I'd be fine pinning the Azurite image or adding the --loose option. I don't think it makes a whole lot of sense to spend time figuring out Azurite as we don't use it anywhere outside local development.

[humitos]

What's the hash of your azurite image?

[humitos]

I re-downloaded the azurite docker image and it works now 🤷‍♂️

[agjohnson]

My azurite is:

mcr.microsoft.com/azure-storage/azurite         latest              741b0142b740        10 days ago         292MB