RDKEMW-16534: Set memory+swap to be unlimited if swap limit is not set

[ks734]

Description

If swap limit is not set explicitly, set memory+swap to be unlimited by default

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (doesn't fit into the above categories - e.g. documentation updates)

Requires Bitbake Recipe changes?

• The base Bitbake recipe (meta-rdk-ext/recipes-containers/dobby/dobby.bb) must be modified to support the changes in this PR (beyond updating SRC_REV)

[Copilot]

Pull request overview

Changes Dobby's default swap behavior so that when swapLimit is not set in a Dobby spec, memory.memsw.limit_in_bytes is left unlimited (-1) instead of being capped at memLimit. Tests and documentation are updated accordingly.

Changes:

• In DobbySpecConfig, set MEM_SWAP to -1 when swapLimit is omitted instead of mirroring memLimit.
• Update L1 unit test to expect SWAP=-1 and rename it to reflect the new default.
• Update L2 swap-limit test to validate "unlimited" semantics (with a sentinel and >1 TiB threshold), and update README accordingly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
bundle/lib/source/DobbySpecConfig.cpp	Defaults MEM_SWAP template value to -1 (unlimited) when swapLimit absent.
tests/L1_testing/tests/DobbySpecConfigTest/DobbySpecConfigTest.cpp	Updates the L1 test to assert the new -1 default.
tests/L2_testing/test_runner/swap_limit_tests.py	Adds an UNLIMITED sentinel and threshold check; switches the test container_id to ram (which reads the wrong cgroup file).
README.md	Documents the new unlimited default for swapLimit.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.