WL#11710: Migrate optimizer tests from main suite to run with default engine innodb

In latest releases , innodb is made as default engine. But tests from main 
suite are written considering myisam as engine from start. As count of tests 
from 
main suite is , so modifications  (tests and/or result) for innodb is big task. 
We currently continue to run main suite test with "myisam" by calling
"include/force_myisam_default.inc" .
So as to make test run with innodb we have to adjust test(and/or result) and
remove "include/force_myisam_default.inc" from each test.

This WL targets changing optimizer related test (where tests are failing mainly
due to difference in explain output )when run with innodb as default engine.
Difference in explain output is for
- index used
- rows ( which vary for innodb)
- Comment field 

**List of test which have failure/result difference related to optimizer (they
might have additional difference too )

Major diff in explain which is recorded for myisam  + parent/child delete error

main.select_found
main.distinct
main.func_compress
main.func_concat
main.func_default
main.func_group
main.select_safe
main.type_date
main.type_datetime
main.func_str
main.func_test
main.view_grant
main.greedy_search
main.group_by