Bug #59055 : Remove ndb tests from repository. Removal of tests from sys_vars is pending. It has some issues that are yet to be resolved

Problem: Warnings for truncated data were generated on hosts with
long host names because @@hostname was inserted into a CHAR(40) column.
Fix: Change CHAR(40) to TEXT.

Introduced by fix for Bug#57687

Major replication test framework cleanup. This does the following:
 - Ensure that all tests clean up the replication state when they
   finish, by making check-testcase check the output of SHOW SLAVE STATUS.
   This implies:
    - Slave must not be running after test finished. This is good
      because it removes the risk for sporadic errors in subsequent
      tests when a test forgets to sync correctly.
    - Slave SQL and IO errors must be cleared when test ends. This is
      good because we will notice if a test gets an unexpected error in
      the slave threads near the end.
    - We no longer have to clean up before a test starts.
 - Ensure that all tests that wait for an error in one of the slave
   threads waits for a specific error. It is no longer possible to
   source wait_for_slave_[sql|io]_to_stop.inc when there is an error
   in one of the slave threads. This is good because:
    - If a test expects an error but there is a bug that causes
      another error to happen, or if it stops the slave thread without
      an error, then we will notice.
    - When developing tests, wait_for_*_to_[start|stop].inc will fail
      immediately if there is an error in the relevant slave thread.
      Before this patch, we had to wait for the timeout.
 - Remove duplicated and repeated code for setting up unusual replication
   topologies. Now, there is a single file that is capable of setting
   up arbitrary topologies (include/rpl_init.inc, but
   include/master-slave.inc is still available for the most common
   topology). Tests can now end with include/rpl_end.inc, which will clean
   up correctly no matter what topology is used. The topology can be
   changed with include/rpl_change_topology.inc.
 - Improved debug information when tests fail. This includes:
    - debug info is printed on all servers configured by include/rpl_init.inc
    - User can set $rpl_debug=1, which makes auxiliary replication files
      print relevant debug info.
 - Improved documentation for all auxiliary replication files. Now they
   describe purpose, usage, parameters, and side effects.
 - Many small code cleanups:
    - Made have_innodb.inc output a sensible error message.
    - Moved contents of rpl000017-slave.sh into rpl000017.test
    - Added mysqltest variables that expose the current state of
      disable_warnings/enable_warnings and friends.
    - Too many to list here: see per-file comments for details.

Additional space-in-directory-name protection.

The 'mysql' include sub-directory was copied directly into
include/ rather than retaining its own directory.

Fix this, and update mysql_config which needs additional
logic to detect the correct prefix for includes.

@prefix@ was erroneously set to '.' with the STANDALONE install
layout, when it should instead be set to CMAKE_INSTALL_PREFIX,
this was likely accidentally copied from scripts/CMakeLists.txt
which has similar handling specifically for mysql_install_db.sh

mysql.server init script can now find the install, assuming the
defaults have been chosen.

           in sql_select.cc

Follow-up patch. Add sanity check for quick select when it is
decided that it should be used.

           make_join_select() in sql_select.cc

Caused by incorrect ASSERT introduced by BUG#58456. Quick selects 
may have index == MAX_KEY if it merges indices.

Fixed that proxy_user may be used uninitialized.

Automerge from mysql-5.1-bugteam.

Post-push fixes:

  - fixed platform dependent result files
  - appeasing valgrind warnings:
   
    Fault injection was also uncovering a previously existing 
    potential mem leaks. For BUG#46166 testing purposes, fixed 
    by forcing handling the leak when injecting faults.

Merging to latest mysql-5.5-bugteam.

Merging to latest mysql-5.1-bugteam.