speed up UI by using database session handler

plugins/TestRunner/Aws/config.ini.php

@@ -17,10 +17,11 @@ password = "secure"
 tables_prefix = ""
 
 [General]
+session_save_handler = "dbtable"
 salt = "ad40b992685bd402cdddaa46bdff537e"
 enable_update_communication = 0
 trusted_hosts[] = "amazonaws.com"
 trusted_hosts[] = "www.example.com"
 trusted_hosts[] = "apache.piwik"
 trusted_hosts[] = "nginx.piwik"
-trusted_hosts[] = "amazonAwsUrl"
+trusted_hosts[] = "amazonAwsUrl"
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