MDEV-20306 Assert when converting encrypted Aria table to S3

Changes:
- maria_create() now uses a bit in the parameter flags to check if table
  should be encrypted instead of using maria_encrypted_tables.
- Don't encrypt tables that are to be converted to S3
- Added encrypted flag to ARIA_TABLE_CAPABILITIES
- maria_chk --description now prints if table is encrypted. Other
  operations is not allowed on encrypted tables.

include/aria_backup.h

@@ -26,6 +26,7 @@ typedef struct st_aria_table_capabilities
   enum data_file_type data_file_type;
   my_bool checksum;
   my_bool transactional;
+  my_bool encrypted;
   /* This is true if the table can be copied without any locks */
   my_bool online_backup_safe;
   /* s3 capabilities */