[VOL-4327] Updated Check Ping keyword to send 30 packets and Check Ping Result keyword to accept upto 4% packet loss

Change-Id: I69b82024da573d9ae51784cfd9522c56f1a029de
diff --git a/requirements.txt b/requirements.txt
index 3b51eb8..fbfc319 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 flake8
 paramiko
 pexpect
-pylint
+pylint<=2.10.2
 pyyaml
 robotframework
 robotframework-databaselibrary