The optimizer takes different execution paths during EXPLAIN than SELECT,
this fix relates only to EXPLAIN, hence no behavior changes.
The test of sort keys for ORDER BY was prohibited from considering keys
that were mentioned in IGNORE KEYS FOR ORDER BY. This led to two 
inconsistencies: One was that IGNORE INDEX FOR GROUP BY and 
IGNORE INDEX FOR ORDER BY gave apparently different EXPLAINs; the latter 
erroneously claimed to do filesort. The second inconsistency 
is that the test of sort keys is called twice, finding a sort key the first
time but not the second time, leading to the mentioned filesort.

Fixed by making the test of sort keys consider all enabled 
keys on the table. This test rejects keys that are not covering, and for 
covering keys the hint should be ignored anyway. 


mysql-test/r/group_by.result:
  Bug#30665: Changed test result. The plan gets more efficient here. 
  The output is included in order to show that it is still correct.
mysql-test/r/order_by.result:
  Bug#30665: Test result
mysql-test/t/group_by.test:
  Bug#30665: Changed test case to show correctness of changed plan
mysql-test/t/order_by.test:
  Bug#30665: Test case
sql/sql_select.cc:
  Bug#30665: 
  - the fix: Give test_if_skip_sort_order all keys not the subset of non-disabled keys.
  - Added comment to test_if_skip_sort_order