remove import doc comments

The "// import <path>" comment has been superseded by Go modules.
We don't have to remove them, but doing so has some advantages:

- They are used inconsistently, which is confusing.
- We can then also remove the (currently broken) hack/update-vanity-imports.sh.
- Last but not least, it would be a first step towards avoiding the k8s.io domain.

This commit was generated with
   sed -i -e 's;^package \(.*\) // import.*;package \1;' $(git grep -l '^package.*// import' | grep -v 'vendor/')

Everything was included, except for
   package labels // import k8s.io/kubernetes/pkg/util/labels
because that package is marked as "read-only".

Kubernetes-commit: 8a908e0c0bd96a3455edf7e3b5f5af90564e65b0

Author: pohly

cmd/defaulter-gen/output_tests/empty/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:defaulter-gen=covers
 
 // This is a test package.
-package empty // import "k8s.io/code-generator/cmd/defaulter-gen/output_tests/empty"
+package empty

cmd/defaulter-gen/output_tests/marker/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:defaulter-gen=TypeMeta
 
 // This is a test package.
-package marker // import "k8s.io/code-generator/cmd/defaulter-gen/output_tests/marker"
+package marker

cmd/defaulter-gen/output_tests/pointer/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:defaulter-gen=TypeMeta
 
 // This is a test package.
-package pointer // import "k8s.io/code-generator/cmd/defaulter-gen/output_tests/pointer"
+package pointer

cmd/defaulter-gen/output_tests/slices/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:defaulter-gen=TypeMeta
 
 // This is a test package.
-package slices // import "k8s.io/code-generator/cmd/defaulter-gen/output_tests/slices"
+package slices

cmd/defaulter-gen/output_tests/wholepkg/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:defaulter-gen=TypeMeta
 
 // This is a test package.
-package wholepkg // import "k8s.io/code-generator/cmd/defaulter-gen/output_tests/wholepkg"
+package wholepkg

doc.go

@@ -14,4 +14,4 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package codegenerator // import "k8s.io/code-generator"
+package codegenerator

examples/HyphenGroup/apis/example/v1/doc.go

@@ -18,4 +18,4 @@ limitations under the License.
 // +k8s:defaulter-gen=TypeMeta
 // +groupName=example-group.hyphens.code-generator.k8s.io
 // +groupGoName=ExampleGroup
-package v1 // import "k8s.io/code-generator/examples/HyphenGroup/apis/example/v1"
+package v1

examples/MixedCase/apis/example/v1/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:deepcopy-gen=package
 // +k8s:defaulter-gen=TypeMeta
 // +groupName=example.crd.code-generator.k8s.io
-package v1 // import "k8s.io/code-generator/examples/MixedCase/apis/example/v1"
+package v1

examples/apiserver/apis/core/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // +k8s:deepcopy-gen=package
 // +groupName=
 
-package core // import "k8s.io/code-generator/examples/apiserver/apis/core"
+package core

examples/apiserver/apis/core/v1/doc.go

@@ -20,4 +20,4 @@ limitations under the License.
 // +k8s:conversion-gen=k8s.io/code-generator/examples/apiserver/apis/core
 // +groupName=
 
-package v1 // import "k8s.io/code-generator/examples/apiserver/apis/core/v1"
+package v1