Fix typos in boto decision_maker()

There are a couple of typos in some setup
marker variables which are used in skip
exceptions, so let's fix them up.

Change-Id: I9b36d3e44973295b6559f795cc41932419dcf910
diff --git a/tempest/thirdparty/boto/test.py b/tempest/thirdparty/boto/test.py
index 62073bd..566ce90 100644
--- a/tempest/thirdparty/boto/test.py
+++ b/tempest/thirdparty/boto/test.py
@@ -79,7 +79,7 @@
 
     except keystoneclient.exceptions.Unauthorized:
         EC2_CAN_CONNECT_ERROR = "AWS credentials not set," +\
-                                " faild to get them even by keystoneclient"
+                                " failed to get them even by keystoneclient"
     except Exception as exc:
         EC2_CAN_CONNECT_ERROR = str(exc)
 
@@ -96,7 +96,7 @@
         S3_CAN_CONNECT_ERROR = str(exc)
     except keystoneclient.exceptions.Unauthorized:
         S3_CAN_CONNECT_ERROR = "AWS credentials not set," +\
-                               " faild to get them even by keystoneclient"
+                               " failed to get them even by keystoneclient"
     boto_logger.logger.setLevel(level)
     return {'A_I_IMAGES_READY': A_I_IMAGES_READY,
             'S3_CAN_CONNECT_ERROR': S3_CAN_CONNECT_ERROR,