[config] Support interface ranges with --from and --to

[dlanov]

[config] Support interface ranges with --from and --to

What I did

Added --from and --to options to config interface startup and config interface shutdown to operate on an inclusive range of configured physical interfaces.

This implements the syntax suggested in #790 while preserving the existing positional single-interface, comma-list, and dash-range behavior.

Examples:

config interface shutdown --from Ethernet0 --to Ethernet40
config interface startup --from Ethernet0 --to Ethernet40

How I did it

• Added --from / --to options to config interface startup and shutdown.
• Selected the range from interfaces actually present in the PORT table.
• Used natural ordering so sparse interface numbering is handled correctly.
• Resolved --from and --to endpoints individually in interface alias mode.
• Preserved the existing multi-ASIC range restriction.
• Added validation for incomplete, reversed, missing-endpoint, and mixed positional/range input.
• Updated doc/Command-Reference.md.
• Added unit coverage for success and validation paths.

For example, if configured ports are:

Ethernet0
Ethernet4
Ethernet8
...
Ethernet40

then --from Ethernet0 --to Ethernet40 operates only on those configured ports and does not generate nonexistent interfaces such as Ethernet1, Ethernet2, or Ethernet3.

How to verify it

Local validation completed successfully:

python3 -m py_compile config/main.py tests/config_test.py
git diff --check

Targeted unit tests were added to tests/config_test.py.

The full unit test environment requires SONiC-specific dependencies such as sonic_py_common and swsscommon, which are not available in the local WSL environment. The PR CI environment can run the complete dependency-backed checks.

Previous command output

Existing positional syntax remains unchanged, for example:

config interface shutdown Ethernet0
config interface startup Ethernet0
config interface shutdown Ethernet8,Ethernet16-20,Ethernet32
config interface startup Ethernet8,Ethernet16-20,Ethernet32

New command output

New range syntax:

config interface shutdown --from Ethernet0 --to Ethernet40
config interface startup --from Ethernet0 --to Ethernet40

Fixes #790

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[mssonicbld]

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[mssonicbld]

Hi, there are workflow run(s) waiting for approval, you may be first-time contributor. I will notify maintainers to help approve once PR is approved. Thanks!

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