Fix flaky test ClatdStartStop in CuttleFish

ClatdStartStop test is still flaky in CuttleFish, add retry mechanism
for process checking related test.

Bug: 124363517
Test: built, flashed, booted
      system/netd/tests/runtests.sh pass

Change-Id: I3bbaedb80661bd3bb22a0dd613f642f2aeb82657
1 file changed