Renaming.

* `FutureMock` is now called `PreparedFuture`
* `FutureCallableMock` is now called `Deferred`
Code remarking

* todo comments added
Service refactoring.

* functional decomposition over connect methods
* services has obtained ability to connect through locator injected
* renaming done
Cocaine-tools: refactoring.

* node info, app check and app restart actions now takes locator object instead of locator host and port
Bugfix and refactoring

* fix multiple locator connections in cocaine-tools
* renaming done
Merge branch 'master' of github.com:cocaine/cocaine-framework-python