CRM-15197 - webtest fix for WebTest_Event_AddPricesetTest.testParticipantWithDateSpecificPriceSet and also fixing possible timeouts caused by Similar Contact warning

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* CRM-15197:
  https://issues.civicrm.org/jira/browse/CRM-15197
Merge pull request #4074 from davecivicrm/CRM-15197b

CRM-15197 - webtest fix for WebTest_Event_AddPricesetTest.testParticipan...