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The problem occurs on Ubuntu where a Spider package is installed on the system
separately from the MariaDB package.  MariaDB and Spider upgrades leave the
Spider plugin improperly installed.  Spider is present in the mysql.plugin
table but is not present in information_schema.

The problem has been corrected in Spider's installation script.  Logic has
been added to check for Spider entries in both information_schema and
mysql.plugin.  If Spider is present in mysql.plugin but is not present in
information_schema, then Spider is first removed from mysql.plugin.  The
subsequent plugin install of Spider will insert entries in both mysql.plugin
and information_schema.

Author:
  Jacob Mathew.

Reviewer:
  Kentoku Shiba.

Cherry-Picked:
  Commit 0897d81 on branch bb-10.3-MDEV-15786