vyos.commit: T8781: move from O(n) to O(1) for commit_in_progress() checks

Historically, commit_in_progress() used psutil.process_iter() to enumerate every
process on the system and inspect open file descriptors under /proc in order to
determine whether the configuration commit lock was held. That approach scales
linearly with process count and incurs substantial overhead under load.

Replace it with the shared lock-file utilities: attempt to acquire the commit
lock using a non-blocking exclusive lock. If acquisition fails, another holder
retains the lock and a commit is considered in progress; if it succeeds, no
commit was active and the lock acquired for the probe is released immediately.

0 files changed, 0 insertions, 0 deletions