test,pkg: add e2e tests (#30)

* test,pkg: add e2e tests

Based on github.com/coreos/vault-operator e2e tests

* vault-operator/test/e2e/backup_restore_test.go: remove test

This test is quite complicated and also requires S3 storage. It's
quite specific as well. The other tests are better for example
purposes.

Author: AlexNPavel

vault-operator/Gopkg.lock

@@ -19,4 +19,4 @@
   name = "github.com/operator-framework/operator-sdk"
   # The version rule is used for a specific release and the master branch for in between releases.
   branch = "master"
-  # version ="v0.0.5" 
+  # version ="v0.0.5"