append blob upload ignores --if-none-match

[baynes]

Description

az storage blob upload --type append --container-name "blocklist" \
        --name "domainsurls-index-append" --file uploadfile --if-none-match \*

Will upload the content (and append it) even if the blob already exists.
If the blob is not of type append then the upload will fail as expected if the blob already exists.

This also applies to using an explicit ETag version with both --if-none-match and --if-match.

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Environment summary

Install Method: How did you install the CLI? (e.g. pip, interactive script, apt-get, Docker, MSI, nightly)
Answer here: apt-get

CLI Version: What version of the CLI and modules are installed? (Use az --version)
Answer here: 2.0.8

OS Version: What OS and version are you using?
Answer here: Ubuntu 16.04.2 LTS

Shell Type: What shell are you using? (e.g. bash, cmd.exe, Bash on Windows)
Answer here: bash and dash

[troydai]

It occurs to me that not all the forms of blob appending API provide the if_none_match option. I'll work with SDK to figure this out. Thanks.

[troydai]

The solution from SDK: Call create_blob for each append blob command to determine if the ETags matches.

[mikeblakeuk]

Is the documentation on the best way to escape the star? should it be \* or '*'?