[verify ci] Fix various issues for rally verify tempest

1. try to fix encoding issue, need to decode Exception.output, otherwise
   cause an decode error while comparing with string.
2. Fix KeyError exception. to_html() would be raised an exception
   since some cases was skipped.
3. Update SQLAlchemy version in upper-constraints.txt

Change-Id: If4574456a07056670581e64c8bfc1672b733dfa8

tests/ci/rally_verify.py

@@ -134,12 +134,15 @@ class Step(object):
                                              stderr=subprocess.STDOUT).decode()
         except subprocess.CalledProcessError as e:
             LOG.error("Command `%s` failed." % command)
-            return Status.ERROR, e.output
+            return Status.ERROR, e.output.decode()
         else:
             return Status.PASS, stdout
 
     def to_html(self):
-        return self.HTML_TEMPLATE % self.result
+        if self.result["status"] == Status.SKIPPED:
+            return ""
+        else:
+            return self.HTML_TEMPLATE % self.result
 
 
 class SetUpStep(Step):
@@ -386,6 +389,7 @@ class ReportVerificationMixin(Step):
         self.CALL_ARGS["uuids"] = " ".join(
             [v["uuid"] for v in self.rapi.verification.list()])
         print(self.COMMAND % self.CALL_ARGS)
+        self.result["out"] = "<None>"
 
     def run(self):
         super(ReportVerificationMixin, self).run()

upper-constraints.txt

@@ -126,8 +126,8 @@ setuptools===40.4.3
 simplejson===3.16.0
 six===1.11.0
 Sphinx==1.8.5;python_version=='2.7'
-SQLAlchemy===1.2.12
-sqlalchemy-migrate===0.11.0
+SQLAlchemy===1.3.4
+sqlalchemy-migrate===0.12.0
 sqlparse===0.2.4
 stevedore===1.29.0
 subprocess32===3.5.2