Ignore error Unable to validate API Key. Please try again in agent info output (#961)

Author: levan-m

test/integration/dd-agent-handler5/serverspec_datadog/dd-agent_spec.rb

@@ -24,7 +24,7 @@
 
 # On Linux kernel >= 5.5, Agent 5 disk check fails because of old psutil version, which doesn't have fix
 # https://github.com/giampaolo/psutil/commit/2e0952e939d6ab517449314876d8d3488ba5b98b
-describe command('/etc/init.d/datadog-agent info | grep -v "API Key is invalid" | grep -v "not sure how to interpret line"'), :if => os[:family] != 'windows' do
+describe command('/etc/init.d/datadog-agent info | grep -v "API Key is invalid" | grep -v "not sure how to interpret line" | egrep -v "Unable to validate API Key. Please try again later"'), :if => os[:family] != 'windows' do
   its(:exit_status) { should eq 0 }
   its(:stdout) { should contain 'OK' }
   its(:stdout) { should_not contain 'ERROR' }