Clean up scripts/validate-*. Add vet,gofmt,lint tests.

Travis now runs `make validate` as first test.
Make validate includes all validate tests (go vet, gofmt)

script/validate-vet

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -e
 
 # Copyright 2016 The Kubernetes Authors All rights reserved.
 #
@@ -16,31 +17,5 @@
 
 source "$(dirname "$BASH_SOURCE")/.validate"
 
-IFS=$'\n'
-files=( $(validate_diff --diff-filter=ACMR --name-only -- '*.go' | grep -v '^vendor/' || true) )
-unset IFS
-
-errors=()
-for f in "${files[@]}"; do
-	# we use "git show" here to validate that what's committed passes go vet
-	failedVet=$(go vet "$f")
-	if [ "$failedVet" ]; then
-		errors+=( "$failedVet" )
-	fi
-done
-
-
-if [ ${#errors[@]} -eq 0 ]; then
-	echo 'Congratulations!  All Go source files have been vetted.'
-else
-	{
-		echo "Errors from go vet:"
-		for err in "${errors[@]}"; do
-			echo " - $err"
-		done
-		echo
-		echo 'Please fix the above errors. You can test via "go vet" and commit the result.'
-		echo
-	} >&2
-	false
-fi
+go vet $PKGS;
+