Fix flaky --max-workers strace assertion on aarch64

[kkaarreell]

Count only process forks (SIGCHLD) from the main keylime-policy PID instead of all clone/clone3 lines, filtering out non-deterministic thread creation in child processes. Also widen the gap by comparing --max-workers 1 vs 5 (difference of 4 forks) instead of 1 vs 3 (difference of 2).

Summary by Sourcery

Stabilize the keylime-policy --max-workers functional test by making the strace-based worker count deterministic and adjusting the comparison to a larger worker difference.

Bug Fixes:

• Prevent flaky assertion in the --max-workers strace test on aarch64 by filtering out non-deterministic thread clones and widening the worker count gap.

Tests:

• Update the strace-based worker counting in keylime-policy functional tests to count only SIGCHLD process forks from the main process and compare --max-workers 1 vs 5.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The test for keylime-policy --max-workers has been made more deterministic and robust by counting only process forks from the main keylime-policy PID in strace output and widening the worker count comparison from 1 vs 3 to 1 vs 5.

File-Level Changes

Change	Details	Files
Make the strace-based --max-workers test deterministic by filtering clone events to the main process and comparing 1 vs 5 workers instead of 1 vs 3.	Change the second strace invocation to use --max-workers 5 and write to strace_5.log instead of using 3 workers and strace_3.log. Extract the main keylime-policy PID from the first line of each strace log using awk and store as MAIN_PID_1 and MAIN_PID_5. Count clone events only for the main PID where the clone leads to SIGCHLD, avoiding nondeterministic thread clones in child processes. Update log messages to reference clone counts for --max-workers 1 and 5 instead of 1 and 3. Update the final assertion to compare CLONES_1 and CLONES_5, ensuring fewer workers with --max-workers 1 than with 5.	functional/keylime-policy-commands/test.sh

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