WL#7263: Migrate myisam specific tests

Main consist of test which are meant to run with myisam,  as a default storage
engine. So we plan to identify myisam based testcases and retain the
force_myisam_default.inc, file and remove the temporary comments from each of
the identified Myisam based testcase. 

Indentify the testcases, based on the following points:
Test with following reason are candidate tests
- Functionality currently supported in myisam only ( e,g spatial index / GIS
tests etc , repair not directly supported in innodb  )
- Tests where implementation vary (e.g test recorded for transactions (as myisam
do not support transactions) , auto increment behavior)
- Test explicitly having myisam in there name
- Tests for which equivalent innodb tests exists ( e.g fulltext )

User Documentation
==================

http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-4.html

List of Tests from main suite


1) Equivalent test exists
main.fulltext
main.fulltext_cache
main.fulltext_left_join
main.fulltext_multi
main.fulltext_order_by
main.fulltext_var
main.type_bit
main.group_min_max

2) test name explicitly specify myisam/related engine
main.wl6219-myisam
main.wl6219-memory
wl6219-csv
main.wl6219-merge
main.myisam
main.myisam_icp
main.myisam_icp_all
main.myisam_icp_none
main.myisam_mrr
main.myisam_mrr_all
main.myisam_mrr_cost
main.myisam_mrr_cost_all
main.myisam_mrr_cost_icp
main.myisam_mrr_icp
main.myisam_mrr_none
main.myisampack
main.heap
main.myisam-blob

3) Not supoorted / behavior is different 
main.gis
main.gis-rtree
main.key_cache
main.query_cache_merge
main.greedy_optimizer
main.preload
main.auto_increment
main.bench_count_distinct
main.compression
main.partition_key_cache
main.partition_pruning
main.repair
main.derived
main.drop-no_root
main.lock_multi
main.single_delete_update