mysql client: Ignore --comments at start of command line. This allows one to more easily run mysqltest tests trough the command line.
Fixed bug: LP#603026 RQG: pagecache_read: Assertion `pageno < ((1ULL) << 40)' on OPTIMIZE TABLE of a Maria table  

client/mysql.cc:
  Removed Oracle copyright from stdout, as Oracle doesn't have copyright to all code in this file.
  Ignore --comments at start of command line. This allows one to more easily run mysqltest tests trough the command line.
mysql-test/suite/maria/r/optimize.result:
  Added test for LP#603026
mysql-test/suite/maria/t/optimize.test:
  Added test for LP#603026
sql/net_serv.cc:
  Removed DBUG_ASSERT(), as this code can happen during testing.
storage/maria/ma_check.c:
  Fixed bug: LP#603026 RQG: pagecache_read: Assertion `pageno < ((1ULL) << 40)' on OPTIMIZE TABLE of a Maria table  
  The problem was duplicated memory usage with long packed keys.