mariadb: upgrade to 5.5.50

Upgrade mariadb from 5.5.46 to 5.5.50.

* update runtime dependency of mariadb-setupdb which requires command install

[AK]
This update appears to be mostly bug fixes and is why is was merge from master.
plus the following securiy fixes

5.5.49:
CVE-2016-0647 CVE-2016-0648 CVE-2016-0666 CVE-2016-0643
CVE-2016-5444 CVE-2016-3452

5.5.48:
CVE-2016-0640 CVE-2016-0644 CVE-2016-0646 CVE-2016-0649
CVE-2016-0650 CVE-2016-0641

5.5.47:
CVE-2016-0546 CVE-2016-0505 CVE-2016-0596 CVE-2016-0597
CVE-2016-0616 CVE-2016-0598 CVE-2016-0600 CVE-2016-0606
CVE-2016-0608 CVE-2016-0609 CVE-2016-0642 CVE-2016-0651
CVE-2016-2047

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit 6255219b93d2af4cf56611fb5b1c3dc55ada2c6b)
Signed-off-by: Armin Kuster <akuster808@gmail.com>