Fix ssh object in fuel_agent_ci

Change-Id: I3ad58fad908eb22aa233ad33579329bd687729e2
Add more enpoints mainly for tests

Change-Id: I8c2d2abc38068b6da59243d73d545dad62097aff
Use another `execute` wrapper + tiny fixes

* Ditch oslo's `execute` wrapper from utils.py;
* Fix first partition beginning;
* Use proper arguments order for `mdadm`;
* Fix unicode string handling for fs_utils;
* Add sleep to execute;

Change-Id: I2987d4ac0480af48fcccc36a562ac7898e941dc7
Initial Functional Tests

Add functional tests for fuel_agent

Change-Id: Ic6739ff9c20547c5d9ab2b4fe9dec45bd5742db9
Fi fix

Change-Id: Ia9fc056562ed12154ae0bb3f7e1ab32edb56cb0b