[testArmZabbixAPI] Change how to check number and move check point.
[testArmZabbixAPI] Merge the test_getEvents() function to the
test_checkNonLeakage() function. And change the test_checkNonLeakage()
function.

Because the test_getEvents() function and test_checkNonLeakage()
function check same the ArmZabbixAPI::updateEvents() function.
And, test occurs a crash in a test_getEvents() function.