Modified Makefile to use containerized tools (v2.0.0)

The "build", "install", and "run" targets have been left as-is, and will continue to use the locally installed go.
Also merged lint-style (gofmt) into golangci-lint (enabled gofmt).
Also removed redundant lint-sanity (govet) which is already checked by golangci-lint.
Also changed lint-mod slightly so it reverts any changes it makes go.mod, go.sum, and vendor/.

VOL-2428 VOL-2647

Change-Id: Iced2839d8e21385c66dd1b8378431af1b966183f
diff --git a/go.mod b/go.mod
index 5ce9c07..9e08b1d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/opencord/voltctl
 
-go 1.12
+go 1.13
 
 require (
 	github.com/Shopify/sarama v1.25.0