[BUILD] Fix gocov-xml

The artifact produced by this build is hypenated, yet
we list it as unhyphenated.  Lets fix this.

Change-Id: Ib99f66d70ef507c9b83315ad7d79a02178edf82b
Signed-off-by: Greg Haskins <gregory.haskins@gmail.com>

gotools/Makefile

@@ -16,7 +16,7 @@
 # under the License.
 #
 
-GOTOOLS = golint govendor goimports protoc-gen-go ginkgo gocov gocovxml
+GOTOOLS = golint govendor goimports protoc-gen-go ginkgo gocov gocov-xml
 GOTOOLS_BIN = $(patsubst %,$(GOPATH)/bin/%, $(GOTOOLS))
 
 # go tool->path mapping
@@ -25,7 +25,7 @@ go.fqp.golint    := github.com/golang/lint/golint
 go.fqp.goimports := golang.org/x/tools/cmd/goimports
 go.fqp.ginkgo    := github.com/onsi/ginkgo/ginkgo
 go.fqp.gocov     := github.com/axw/gocov/...
-go.fqp.gocovxml  := github.com/AlekSi/gocov-xml
+go.fqp.gocov-xml := github.com/AlekSi/gocov-xml
 
 all: $(GOTOOLS_BIN)