Ignore solaris in vendor/vendor.json per

Issue is for godep, but references govendor and explains problem with
missing 'golang.org/x/sys/unix' which logrus solaris required.
https://github.com/tools/godep/issues/377

vendor/vendor.json

@@ -1,6 +1,6 @@
 {
 	"comment": "",
-	"ignore": "test",
+	"ignore": "test, solaris",
 	"package": [
 		{
 			"checksumSHA1": "2avCvSn0XonfApKKuTMyiQmk7s0=",