Fixes some typos in tempest

Just typos found when I browsed through tempest code

Change-Id: Ic2cf07ccaada9b79bf3d7ae5f5634dabcb1e8880
diff --git a/tempest/cli/output_parser.py b/tempest/cli/output_parser.py
index f22ec4e..bb3368f 100644
--- a/tempest/cli/output_parser.py
+++ b/tempest/cli/output_parser.py
@@ -158,7 +158,7 @@
 def _table_columns(first_table_row):
     """Find column ranges in output line.
 
-    Return list of touples (start,end) for each column
+    Return list of tuples (start,end) for each column
     detected by plus (+) characters in delimiter line.
     """
     positions = []