Backporting from trunk to 5.6 the skipping logic for the below perfschema tests, with Query Cache Enabled.

added:
  mysql-test/include/have_QC_Disabled.inc
modified:
  mysql-test/suite/perfschema/t/aggregate.test
  mysql-test/suite/perfschema/t/event_aggregate.test
  mysql-test/suite/perfschema/t/event_aggregate_no_a.test
  mysql-test/suite/perfschema/t/event_aggregate_no_a_no_h.test
  mysql-test/suite/perfschema/t/event_aggregate_no_a_no_u.test
  mysql-test/suite/perfschema/t/event_aggregate_no_a_no_u_no_h.test
  mysql-test/suite/perfschema/t/event_aggregate_no_h.test
  mysql-test/suite/perfschema/t/event_aggregate_no_u.test
  mysql-test/suite/perfschema/t/event_aggregate_no_u_no_h.test
  mysql-test/suite/perfschema/t/nesting.test
  mysql-test/suite/perfschema/t/view_table_io.test