Merge pull request #62436 from ixdy/kazelcfg-ignore-third_party-etcd

Automatic merge from submit-queue (batch tested with PRs 62436, 62499, 62664, 62685, 62660). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

kazel: skip third_party/etcd.*

**What this PR does / why we need it**: fixes the issue encountered in https://github.com/kubernetes/kubernetes/pull/62151#discussion_r179322174.

Basically, we git ignore anything under `third_party/etcd.*`, but if a `BUILD` file ends up in there somehow, it'll confuse kazel and generate invalid entries in top-level `BUILD` files that we do check in. We can avoid this issue by instructing kazel to ignore these directories.

**Release note**:

```release-note
NONE
```

/assign @mikedanese @thockin @BenTheElder

build/root/.kazelcfg.json

@@ -1,7 +1,8 @@
 {
 	"GoPrefix": "k8s.io/kubernetes",
 	"SkippedPaths": [
-		"^_.*"
+		"^_.*",
+		"^third_party/etcd.*"
 	],
 	"AddSourcesRules": true,
 	"K8sOpenAPIGen": true

third_party/BUILD

@@ -4,8 +4,13 @@ licenses(["notice"])
 
 filegroup(
     name = "package-srcs",
-    srcs = glob(["**"]),
-    tags = ["automanaged"],
+    srcs = glob(
+        ["**"],
+        exclude = [
+            "etcd*/**",
+            "etcd*.tar.gz",
+        ],
+    ),
     visibility = ["//visibility:private"],
 )