MDEV-10248 Cannot Remove Test Tables

While dropping the test database, use IF EXISTS to avoid bogus errors

scripts/mysql_secure_installation.pl.in

@@ -217,7 +217,7 @@ sub remove_remote_root {
 
 sub remove_test_database {
   print " - Dropping test database...\n";
-  if (do_query("DROP DATABASE test;")) {
+  if (do_query("DROP DATABASE IF EXISTS test;")) {
     print " ... Success!\n";
   } else {
     print " ... Failed!  Not critical, keep moving...\n";

scripts/mysql_secure_installation.sh

@@ -324,7 +324,7 @@ remove_remote_root() {
 
 remove_test_database() {
     echo " - Dropping test database..."
-    do_query "DROP DATABASE test;"
+    do_query "DROP DATABASE IF EXISTS test;"
     if [ $? -eq 0 ]; then
 	echo " ... Success!"
     else