* Adds new worker for cert management
* Makes decrypt use an rpc to the worker
* Moves CA filesystem creation out of cloud.setup
* Moves test for X509 into crypto
* Adds test for encrypting and decrypting using cert
* Cleans up extra code in cloudpipe
* Fixes bug 918563
* Prepares for a future patch that will fix bug 903345
Change-Id: I4693c50c8f432706f97395af39e736f49d60e719