Revert "Switch to new vendor directory layout"

This reverts commit d5742209d3.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/Azure/go-ansiterm/utilities.go

@@ -1,21 +0,0 @@
-package ansiterm
-
-import (
-	"strconv"
-)
-
-func sliceContains(bytes []byte, b byte) bool {
-	for _, v := range bytes {
-		if v == b {
-			return true
-		}
-	}
-
-	return false
-}
-
-func convertBytesToInteger(bytes []byte) int {
-	s := string(bytes)
-	i, _ := strconv.Atoi(s)
-	return i
-}