add vendoring with go dep

vendor/github.com/vmware/govmomi/.drone.yml

@@ -0,0 +1,17 @@
+clone:
+  tags: true
+  path: github.com/vmware/govmomi
+build:
+  image: golang:1.7
+  pull: true
+  environment:
+    - GOVC_TEST_URL=$$GOVC_TEST_URL
+    - GOVC_INSECURE=1
+    - VCA=1
+  commands:
+    - make all install
+    - git clone https://github.com/sstephenson/bats.git /tmp/bats
+    - /tmp/bats/install.sh /usr/local
+    - apt-get -qq update && apt-get install -yqq uuid-runtime bsdmainutils jq
+    - govc/test/images/update.sh
+    - bats govc/test