Makefile, get-protec.sh: Use bsdtar instead of unzip

Apparently there are multiple implementations of 'unzip' floating around
that take different flags.  And the given invocations don't work with the
version that I have.  'bsdtar' is pretty uniform from one place to
another.

Author: LukeShu

.travis.yml

@@ -9,6 +9,11 @@ go:
 services:
   - docker
 
+addons:
+  apt:
+    packages:
+    - bsdtar
+
 env:
   - K8S_CLIENT_TEST=1 KUBECONFIG=scripts/kubeconfig
 

Makefile

@@ -44,7 +44,7 @@ _output/bin/protoc:
 _output/kubernetes:
 	mkdir -p _output
 	curl -o _output/kubernetes.zip -L https://github.com/kubernetes/kubernetes/archive/v$(KUBE_VERSION).zip
-	unzip _output/kubernetes.zip -d _output > /dev/null
+	bsdtar -x -f _output/kubernetes.zip -C _output > /dev/null
 	mv _output/kubernetes-$(KUBE_VERSION) _output/kubernetes
 
 .PHONY: clean

scripts/get-protoc.sh

@@ -6,4 +6,4 @@ if [ "$OS" == "Darwin" ]; then
 fi
 
 curl -L -o _output/protoc.zip https://github.com/google/protobuf/releases/download/v3.5.1/protoc-3.5.1-${OS}-x86_64.zip
-unzip _output/protoc.zip bin/protoc -d _output
+bsdtar -x -f _output/protoc.zip -C _output bin/protoc