Handle dict extras in Voluptuous Schema

Not sure if schema requirements changed but it is no longer valid to
use:

  Schema({}, extra=True)

The docs say that should be avoided and instead you should use:

  Schema(dict)

To indicate a dict that can have any key: value pairs. Additionally
extra=True appears to be replaced with extra=ALLOW_EXTRA so update that
in cases where we have some subset of desired keys.

Change-Id: I3dc966dae534416f2b601ec8d299e1d0e3651e7b

zuul/configloader.py

@@ -582,7 +582,7 @@ class PipelineParser(object):
                               'email': str,
                               'older-than': str,
                               'newer-than': str,
-                              }, extra=True)
+                              }, extra=vs.ALLOW_EXTRA)
 
         require = {'approval': to_list(approval),
                    'open': bool,

zuul/driver/gerrit/gerritconnection.py

@@ -819,5 +819,5 @@ class GerritConnection(BaseConnection):
 
 
 def getSchema():
-    gerrit_connection = v.Any(str, v.Schema({}, extra=True))
+    gerrit_connection = v.Any(str, v.Schema(dict))
     return gerrit_connection

zuul/driver/gerrit/gerritreporter.py

@@ -48,5 +48,5 @@ class GerritReporter(BaseReporter):
 
 
 def getSchema():
-    gerrit_reporter = v.Any(str, v.Schema({}, extra=True))
+    gerrit_reporter = v.Any(str, v.Schema(dict))
     return gerrit_reporter

zuul/driver/gerrit/gerrittrigger.py

@@ -82,14 +82,14 @@ def validate_conf(trigger_conf):
 def getSchema():
     def toList(x):
         return v.Any([x], x)
-    variable_dict = v.Schema({}, extra=True)
+    variable_dict = v.Schema(dict)
 
     approval = v.Schema({'username': str,
                          'email-filter': str,
                          'email': str,
                          'older-than': str,
                          'newer-than': str,
-                         }, extra=True)
+                         }, extra=v.ALLOW_EXTRA)
 
     gerrit_trigger = {
         v.Required('event'):

zuul/driver/git/gitconnection.py

@@ -59,5 +59,5 @@ class GitConnection(BaseConnection):
 
 
 def getSchema():
-    git_connection = v.Any(str, v.Schema({}, extra=True))
+    git_connection = v.Any(str, v.Schema(dict))
     return git_connection

zuul/driver/smtp/smtpconnection.py

@@ -58,5 +58,5 @@ class SMTPConnection(BaseConnection):
 
 
 def getSchema():
-    smtp_connection = v.Any(str, v.Schema({}, extra=True))
+    smtp_connection = v.Any(str, v.Schema(dict))
     return smtp_connection

zuul/driver/sql/sqlconnection.py

@@ -101,5 +101,5 @@ class SQLConnection(BaseConnection):
 
 
 def getSchema():
-    sql_connection = v.Any(str, v.Schema({}, extra=True))
+    sql_connection = v.Any(str, v.Schema(dict))
     return sql_connection

zuul/driver/zuul/zuultrigger.py

@@ -63,7 +63,7 @@ def getSchema():
                          'email': str,
                          'older-than': str,
                          'newer-than': str,
-                         }, extra=True)
+                         }, extra=v.ALLOW_EXTRA)
 
     zuul_trigger = {
         v.Required('event'):