Fix for Bug#26890 main.multi_update times out

The test itself is not faulty. The testcase timeout
problem happens if this IMHO mid size resource
(space in vardir, virtual memory, amount of disk I/O)
consuming test meets a weak (excessive disk I/O caused
by parallel applications or paging) testing box.

The modifications:
- Move the most time and disk I/O consuming subtest
  for Bug 1820 into its own script (multi_update2)
  This will reduce the likelihood that we exceed the
  testcase timeout.
- Replace error numbers with error names
- Minor improvements of the formatting

- 

1 files changed, 1 insertions, 0 deletions

diff --git a/mysql-test/t/multi_update2-master.opt b/mysql-test/t/multi_update2-master.opt
new file mode 100644
index 00000000000..9f1a29461ff
--- /dev/null
+++ b/mysql-test/t/multi_update2-master.opt
@@ -0,0 +1 @@
+--set-variable=tmp_table_size=1024