When MariaDB 10.1.0 introduced table options for encryption and
compression, it unnecessarily changed
ha_innobase::check_if_supported_inplace_alter() so that ALGORITHM=COPY
is forced when these parameters differ.
A better solution is to move the check to innobase_need_rebuild().
In that way, the ALGORITHM=INPLACE interface (yes, the syntax is
very misleading) can be used for rebuilding the table much more
efficiently, with merge sort, with no undo logging, and allowing
concurrent DML operations.
Problem is that tests restart the server and "shutdown_server" looks
for pid file # which is not there with embedded mode.
Fix tests so that they are not run with embedded mode.
Problem is that page compressed tables currently require atomic_blobs and
that feature is not availabe currently for row_format=redundant.
Fix: Disallow page compressed create option if table row_format=redundant.
