Add additional validation to swarming v1 distributor.

dm/api/distributor/swarming/v1/config.pb.go

Index: dm/api/distributor/swarming/v1/config.pb.go
diff --git a/dm/api/distributor/swarming/v1/config.pb.go b/dm/api/distributor/swarming/v1/config.pb.go
index 7ff1e88f9912365cdc4ba5fb882de80473360668..812745b3e748945307fa354289014e9dcaa7d780 100644
--- a/dm/api/distributor/swarming/v1/config.pb.go
+++ b/dm/api/distributor/swarming/v1/config.pb.go
@@ -60,7 +60,7 @@ func (m *Config) GetIsolate() *Config_Isolate {
 }
 
 type Config_Swarming struct {
-	Host string `protobuf:"bytes,1,opt,name=host" json:"host,omitempty"`
+	Url string `protobuf:"bytes,1,opt,name=url" json:"url,omitempty"`
 }
 
 func (m *Config_Swarming) Reset()                    { *m = Config_Swarming{} }
@@ -70,7 +70,7 @@ func (*Config_Swarming) Descriptor() ([]byte, []int) { return fileDescriptor0, [
 
 type Config_Isolate struct {
 	// The host of the isolate service, e.g. isolateserver.appspot.com.
-	Host string `protobuf:"bytes,1,opt,name=host" json:"host,omitempty"`
+	Url string `protobuf:"bytes,1,opt,name=url" json:"url,omitempty"`
 	// The default assumed expiration period for execution results.
 	Expiration *google_protobuf.Duration `protobuf:"bytes,2,opt,name=expiration" json:"expiration,omitempty"`
 }
@@ -99,19 +99,19 @@ func init() {
 
 var fileDescriptor0 = []byte{
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