Merge tag 'mysql-5.7.6' into mysql-5.7.7-rc-release.

This is a null merge to include commits previously cherry-picked into
5.7.6 in the history of 5.7.7.

Upmerge of the 7.1.35 build

Upmerge of the 7.1.35 build

Upmerge of the 7.1.35 build

Bug #20730155: BACKPORT BUG#19699237 TO 5.1

Backport from mysql-5.5 to mysql-5.1

Bug# 19699237: UNINITIALIZED VARIABLE IN
               ITEM_FIELD::STR_RESULT LEADS TO INCORRECT
               BEHAVIOR

ISSUE:
------
When the following conditions are satisfied in a query, a
server crash occurs:
a) Two rows are compared using a NULL-safe equal-to operator.
b) Each of these rows belong to different charsets.

SOLUTION:
---------
When one charset is converted to another for comparision,
the constructor of "Item_func_conv_charset" is called.
This will attempt to use the Item_cache if the string is a
constant. This check succeeds because the "used_table_map"
of the Item_cache class is never set to the correct value.
Since it is mistakenly assumed to be a constant, it tries
to fetch the relevant null value related fields which are
yet to be initialized. This results in valgrind issues
and wrong results.

The fix is to update the "used_table_map" of "Item_cache".
This will allow "Item_func_conv_charset" to realise that
this is not a constant.

Bumped rpm version for oel due to respin

Revert accidental bump of server version back to 5.6.23

BUG#19811871 VERSION NUMBR NOT SHOWN IN LOG WHEN [RE]STARTING 5.6.21 …

…SERVICE WITH SLES11 REPO

Log file directory had too strict access rights, server not able
to write to log file.

Signed-off-by: Terje Røsten <[email protected]>

Bug#20518217 M_I_DB SHOULD RUN WITH -V OPTION WITH DEPLOYMENT SCRIPTS…

… TO GET ROOT PASSWORD

Switch to new init mechanism offered by mysqld option --initialize,
change align all rpm based installs.

Signed-off-by: Terje Røsten <[email protected]>
(cherry picked from commit 08592c3cfe370f5a9154f8a04515e2b709b75d15)

Revert accidental version number change