Fixes #4507

Description

Root cause

ngc moved from ./ngc to ./ngc-cli/ngc
ngc.md5 renamed to ngc-cli.md5
so the files cannot be found.

Solution

1. copy /opt/tools/ngc-cli/ngc to /opt/tools/ngc to make sure /opt/tools/ngc exist
2. fixed the md5 file name, and replaced md5 check commands to official recommonded.
3. changed ngc download url to https://ngc.nvidia.com/downloads/ngccli_linux.zip, in case ngccli_cat_linux.zip is abandoned.

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.