Fix incorrect strings and formatting

There were a few typos and some lines of code that weren't formatted
properly. Now, the typos are fixed and the misformatted code is
corrected.

Change-Id: I6009e44f65b9be1ae9edc806618342c334b2fa92

watcher/common/exception.py

@@ -207,7 +207,7 @@ class AuditTemplateAlreadyExists(Conflict):
 
 class AuditTemplateReferenced(Invalid):
     msg_fmt = _("AuditTemplate %(audit_template)s is referenced by one or "
-                "multiple audit")
+                "multiple audits")
 
 
 class AuditTypeNotFound(Invalid):
@@ -317,7 +317,7 @@ class AuthorizationFailure(WatcherException):
 
 
 class KeystoneFailure(WatcherException):
-    msg_fmt = _("'Keystone API endpoint is missing''")
+    msg_fmt = _("Keystone API endpoint is missing")
 
 
 class ClusterEmpty(WatcherException):

watcher/common/utils.py

@@ -165,7 +165,7 @@ def extend_with_strict_schema(validator_class):
                 raise exception.AuditParameterNotAllowed(parameter=para)
 
             for error in validate_properties(
-                    validator, properties, instance, schema
+                validator, properties, instance, schema
             ):
                 yield error