smoketest: T9048: keep VRF and cmdline assertions on the same PID

Adversarial review findings on the previous head:

* get_process_cmdline() could re-resolve a NEW PID after the
  'ip vrf pids' membership assertion had already run against the old
  one, so the two assertions could validate different processes. The
  helper now returns the (pid, cmdline) pair it actually validated and
  the VRF checks moved after it, targeting the returned PID.

* The one-shot retry left a residual double-race window. The helper
  now polls PID discovery and the /proc read together under the same
  PROCESS_WAIT_TIMEOUT deadline.

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