Cleanup glide (#1353)

* Cleanup mentions about glide

* Don't use glide to ignore vendor directory

Since go-1.9, "./..." no longer contains the "vendor" directory.
Also, since #1305 migrated dependency management from glide to go mod,
there is no need to think about the "vendor" directory.

See: https://golang.org/doc/go1.9#vendor-dotdotdot

* go mod tidy

Makefile

@@ -16,7 +16,6 @@
 
 GITCOMMIT := $(shell git rev-parse --short HEAD)
 BUILD_FLAGS := -ldflags="-w -s -X github.com/kubernetes/kompose/pkg/version.GITCOMMIT=$(GITCOMMIT)"
-PKGS = $(shell glide novendor)
 TEST_IMAGE := kompose/tests:latest
 
 default: bin
@@ -48,13 +47,13 @@ clean:
 
 .PHONY: test-unit
 test-unit:
-	go test -short $(BUILD_FLAGS) -race -cover -v $(PKGS)
+	go test -short $(BUILD_FLAGS) -race -cover -v ./...
 
 # Run unit tests and collect coverage
 .PHONY: test-unit-cover
 test-unit-cover:
 	# First install packages that are dependencies of the test.
-	go test -short -i -race -cover $(PKGS)
+	go test -short -i -race -cover ./...
 	# go test doesn't support colleting coverage across multiple packages,
 	# generate go test commands using go list and run go test for every package separately
 	go list -f '"go test -short -race -cover -v -coverprofile={{.Dir}}/.coverprofile {{.ImportPath}}"' github.com/kubernetes/kompose/...  | grep -v "vendor" | xargs -L 1 -P4 sh -c
@@ -91,11 +90,6 @@ lint:
 gofmt:
 	./script/check-gofmt.sh
 
-# Checks if there are nested vendor dirs inside Kompose vendor and if vendor was cleaned by glide-vc
-.PHONY: check-vendor
-check-vendor:
-	./script/check-vendor.sh
-
 # Run all tests
 .PHONY: test
 test: bin test-dep  validate test-unit-cover install test-cmd