oeqa ping.py: avoid busylooping failing ping command

Use a sleep on error path before trying again. For example
when oeqa runtime tests are executed without setting target
IP address correctly, the tests are drowning logs with messages:

2023-04-04 07:19:24,985 - runtime - INFO - test_ping (ping.PingTest.test_ping)
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
ping: usage error: Destination address required
...
2023-04-04 07:19:55,002 - runtime - INFO -  ... FAIL
2023-04-04 07:19:55,002 - runtime - INFO - Traceback (most recent call
last):
  File \"/lava-62618/3/tests/3_oeqa-runtime-tests/image/lib/oeqa/runtime/cases/ping.py\", line 23, in test_ping
    output += proc.communicate()[0].decode('utf-8')
              ^^^^^^^^^^^^^^^^^^
  File \"/usr/lib/python3.11/subprocess.py\", line 1194, in communicate
    stdout = self.stdout.read()
             ^^^^^^^^^^^^^^^^^^
  File \"/lava-62618/3/tests/3_oeqa-runtime-tests/image/lib/oeqa/core/decorator/oetimeout.py\", line 18, in _timeoutHandler
    raise OEQATimeoutError(\"Timed out after %s \"
oeqa.core.exception.OEQATimeoutError: Timed out after 30 seconds of execution

(From OE-Core rev: 87ec75710b5cd7b3f35d886003844d62d3182b54)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/meta/lib/oeqa/runtime/cases/ping.py b/meta/lib/oeqa/runtime/cases/ping.py
index 967b44175f..fcb72d4543 100644
--- a/meta/lib/oeqa/runtime/cases/ping.py
+++ b/meta/lib/oeqa/runtime/cases/ping.py
@@ -5,6 +5,7 @@
 #
 
 from subprocess import Popen, PIPE
+from time import sleep
 
 from oeqa.runtime.case import OERuntimeTestCase
 from oeqa.core.decorator.oetimeout import OETimeout
@@ -25,6 +26,7 @@ class PingTest(OERuntimeTestCase):
                     count += 1
                 else:
                     count = 0
+                    sleep(1)
         except OEQATimeoutError:
             self.fail("Ping timeout error for address %s, count %s, output: %s" % (self.target.ip, count, output))
         msg = ('Expected 5 consecutive, got %d.\n'