Update makefiles to use specific helm version

Helm is now called by HELM_BIN variable which by default is set to helm
and makefiles use helm from path. HELM_BIN can be overwritten so user
can have two version of helm in system and choose which one to use.

Signed-off-by: Jakub Latusek <j.latusek@samsung.com>
Issue-ID: OOM-2562
Change-Id: I0917796aafe234e87afa0ac3c4c15720296276d5
diff --git a/kubernetes/contrib/components/netbox/Makefile b/kubernetes/contrib/components/netbox/Makefile
index 3194d40..da18203 100644
--- a/kubernetes/contrib/components/netbox/Makefile
+++ b/kubernetes/contrib/components/netbox/Makefile
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+HELM_BIN := helm
 
 make-netbox:
-	cd charts && helm dep up netbox-postgres && helm dep up netbox-nginx && helm dep up netbox-app
+	cd charts && $(HELM_BIN) dep up netbox-postgres && $(HELM_BIN) dep up netbox-nginx && $(HELM_BIN) dep up netbox-app