[hotfix] netappfiles download url 404 blocks CI both in azure-cli and azure-cli-extensions

[haroldrandom]

The download URL seems to be invalid.

▶ dig anfclipython.blob.core.windows.net

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> anfclipython.blob.core.windows.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 21311
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;anfclipython.blob.core.windows.net. IN A

;; Query time: 66 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Sat Feb 22 02:33:33 UTC 2020
;; MSG SIZE  rcvd: 63

it blocks PR by failed a CI check "IndexVerify":

1. fix bug aks-preview to use float(nan) #1304
2. Adding endpoint type option to the extension #1241

Also, will fail CI of Azure/azure-cli

---

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

[azuresdkci]

If this PR is for a new extension or change to an existing extension, use the following to try out the changes in this PR:

docker run -it microsoft/azure-cli:latest
export EXT=<NAME>
pip install --upgrade --target ~/.azure/cliextensions/$EXT "git+https://github.com/haroldrandom/azure-cli-extensions.git@hotfix-netappfiles-downloadurl-404#subdirectory=src/$EXT&egg=$EXT"

[yungezz]

HI @leonardbf , pls look at this PR also.

[yonzhan]

add to S166.

[yonzhan]

LGTM

[haroldrandom]

Merge it seems no response from netappfiles teams and block several PR in both Azure/azure-cli and Azure/azure-cli-extensions.