HBASE-28254 Flaky test: TestTableShell (apache#5590)

Add some delay (1/1000s) between HBase shell commands in Ruby to avoid two commands ending up with the same version.

Signed-off-by: Wellington Ramos Chevreuil <wchevreuil@apache.org>
Signed-off-by: Nihal Jain <nihaljain@apache.org>
Signed-off-by: Balazs Meszaros <meszibalu@apache.org>

hbase-shell/src/test/ruby/hbase/table_test.rb

@@ -681,11 +681,15 @@ def teardown
       create_test_table(@test_name_raw)
       @test_table = table(@test_name_raw)
 
-      # Instert test data
+      # Insert test data
       @test_table.put(1, "x:a", 1)
+      sleep(1.0/1000.0)
       @test_table.put(2, "x:raw1", 11)
+      sleep(1.0/1000.0)
       @test_table.put(2, "x:raw1", 11)
+      sleep(1.0/1000.0)
       @test_table.put(2, "x:raw1", 11)
+      sleep(1.0/1000.0)
       @test_table.put(2, "x:raw1", 11)
 
       args = {}