chore(controller-sdk-go): update DEV_ENV_WORK_DIR

Author: lijianguo

Makefile

@@ -2,7 +2,7 @@
 REPO_PATH = github.com/drycc/controller-sdk-go
 
 DEV_ENV_IMAGE := drycc/go-dev
-DEV_ENV_WORK_DIR := /go/src/${REPO_PATH}
+DEV_ENV_WORK_DIR := /opt/drycc/go/src/${REPO_PATH}
 
 # Enable vendor/ directory support.
 export GO15VENDOREXPERIMENT=1