Fixed logstasher logging targets in prod. env

Logstasher now respects the ROCCI_SERVER_LOG_DIR env variable when
running in production environment.
Fixed context handling for cloud-init in ONE

* Creating a compute instance without an os_tpl mixin has been deprecated
  and will be removed BEFORE the first stable release!
* Cloud-init configs from USER_DATA are decoded before they are passed
  to ONE
Minor formatting changes in logging for ONE
Refactored helpers for ONE backend (no fc. changes)
Refactored network helpers for ONE backend
Refactored storage helpers for ONE backend
Parsing context attrs to cmpt instances in ONE
Fixed mistakenly removed dep on IPAddr in ONEb
Temporary fix for UD w/ quotes for ONE backend