fix memory leaks reported by valgrind

Add query_len variable to st_query, avoids a lot of strlen and allows better allocation of dynamic strings
Tune some inital allocations of dynamic strings

 - Disable 3 test cases that crashes slave

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-new-maint

into  orca.ndb.mysql.com:/space_old/pekka/ndb/version/my51-bug14935

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-new-maint

 - Add prelocking for stored procedures that uses sp or sf
 - Update test result for sp_error(reported as bug#21294)
 - Make note about new error message from sp-error(bug#17244)

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-new-maint

into  chilla.local:/home/mydev/mysql-5.1-amerge

(well, im_options in this case, but using existing bug report)

into  willster.(none):/home/stewart/Documents/MySQL/5.1/main

Fixes for change that makes default appear in NODEGROUP as it should be instead of 0 which is an error