Convert generated-deep-copies to use golang.org/x/tools/imports

I don't like users to need an external binary which can easily get out
of sync. Just include the tools.

hack/after-build/update-generated-deep-copies.sh

@@ -36,27 +36,14 @@ function generate_version() {
 
 	echo "Generating for ${version}"
 
-	# version is group/version, so use the version number as the package name unless
-	# this is an internal version, in which case use the group name. 
-	pkgname=${version##*/}
-	if [[ -z $pkgname ]]; then
-		pkgname=${version%/*}
-	fi
-
 	sed 's/YEAR/2015/' hack/boilerplate/boilerplate.go.txt > $TMPFILE
 	cat >> $TMPFILE <<EOF
-package $pkgname
+// DO NOT EDIT. THIS FILE IS AUTO-GENERATED BY \$KUBEROOT/hack/update-generated-deep-copies.sh.
 
-// AUTO-GENERATED FUNCTIONS START HERE
 EOF
 
 	"${gendeepcopy}" -v "${version}" -f - -o "${version}=" >>  "$TMPFILE"
 
-	cat >> "$TMPFILE" <<EOF
-// AUTO-GENERATED FUNCTIONS END HERE
-EOF
-
-	goimports -w "$TMPFILE"
 	mv "$TMPFILE" `result_file_name ${version}`
 }