Select count(*) returned 2 on empty table where handler
used exact count
mysql-test/r/partition.result:
New test case for Bug #13323
mysql-test/t/partition.test:
New test case for Bug #13323
sql/ha_partition.cc:
Fix for Bug #13323
Used AND when modulo should have been used to calculate partition id
for PARTITION BY KEY and SUBPARTITION BY KEY
mysql-test/r/partition.result:
New test for Bug #13154
mysql-test/t/partition.test:
New test for Bug #13154