mariadb: fix warning while invoking 'mysql_install_db' on target
mariadb: fix warning while invoking 'mysql_install_db' on target

Invoke 'mysql_install_db' on target, there are some warnings:
...
Installing MariaDB/MySQL system tables...
131009  6:13:14 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead.
OK
Filling help tables...
131009  6:13:14 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead.
OK
...

Modify my.cnf to use '--skip-external-locking' instead of '--skip-locking'
could fix this issue.

Signed-off-by: Hongxu Jia <d55095dfc8448df446bb9592fdc085838a3794a7@windriver.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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