[manila] Make requested memory of mariadb match buffer pool size (#1412)
[manila] Make requested memory of mariadb match buffer pool size (#1412)

* adjust buffer pool size
* Increase request memory for  maraidb to 10Gb

Memory size Manila mariadb consumes is at least as much as
buffer_pool_size. And according to the doc, the total allocated memory
is about 10% larger than specified buffer pool size.

Pick the buffer pool size according to the innoDB data and indexes size
(https://dba.stackexchange.com/a/27341). In regions like eu-de-1,
current buffer pool usage is about a few hundred MB, therefore it seems
to be safe to reduce the buffer pool size from 8GB to 4GB.

cf: https://mariadb.com/kb/en/innodb-buffer-pool/




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