Merge branch 'mysql-5.6' into mysql-5.7

(cherry picked from commit e040ef09b9e9dc63946bf2497bf39127ec18ea79)

Bug#22147191	NO PACKAGE FOR UBUNTU 15.10

* Adds wily (15.10) packaging

Bug#21973610: BUFFER OVERFLOW ISSUES

post push fix : Fixing test failures

Bug#21938432 MYSQL_UPGRADE 5.7.9 FAILS WITH ERROR ON MYSQL.SYS USER O…

…N DUMP UPGRADE

* Two problems here:
** Now WITH_PERFSCHEMA_STORAGE_ENGINE is not set we were assuming the installed sys schema version was always 1.0.0, removed this now
** Also FLUSH PRIVILEGES after creating the user, so it is available straight away

Bug#21935210 MYSQL.SYS@LOCALHOST HAS TRIGGER PRIVILEGE ON THE WHOLE INSTANCE
* Removed global TRIGGER, and added only on the sys schema

Bug#21966366 SYS: PROVIDE A WAY TO ALLOW FOR LOCAL CUSTOMISATIONS
* Rather than check for equality of counts, check for at least as many as expected (but allow more or equal)

Sneak in a typo fix (s/procdure/procedure/) in the execute_prepared_stmt comment.

Reviewed-by: Georgi Kodinov <georgi.kodinov@oracle.com>
Reviewed-by: Marc Alff <marc.alff@oracle.com>
RB: 10567
(cherry picked from commit dde827eccabfc5d8954977d0251b7dba3cce8342)

Upmerge of the 7.3.11 build

Upmerge of the 7.2.22 build

Updated yassl to yassl-2.3.8

(cherry picked from commit 7f9941eab55ed672bfcccd382dafbdbcfdc75aaa)

Updated yassl to yassl-2.3.8

(cherry picked from commit 7f9941eab55ed672bfcccd382dafbdbcfdc75aaa)

Upmerge of the 7.1.37 build

Merge tag 'mysql-5.1.77' into mysql-5.1-telco-7.1