TWSD-1164 - Can not able to create VA with FTP URL only on Web UI but CLI works with same FTP URL

Review Request #1180 — Created Nov. 21, 2025 and submitted — Latest diff uploaded

Information
shuinvy
AVX2
rel_avx_2_7_5
TWSD-1164
Reviewers
austin, stevenku 
Allow anonymous connection for ftp url
I tested FTP with authentication URL first,

then modified code for anonymous connection.

I also check SFTP is okay after my changes.

Besides,

there is typo in download_sftp_image.py.

For SFTP,

there maybe will not 100% at last, so I added update progress code to force it 100% after reading file data.(After while loop)
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