MDEV-6361: innodb_compression_algorithm configuration variable can
be set to unsupported value.

MDEV-6350: Excessive unnecessary memory allocation at InnoDB/XtraDB
startup if LZO is installed.
Fix test failure when trying to set compression algorithm to 3
Merge branch '10.1' of github.com:MariaDB/server into 10.1

Conflicts:
	storage/xtradb/handler/ha_innodb.cc