Issue 11

Added checkings if AppAromor service exists.
Update... The first time I run it using passwd I get:

```
TASK: [Configure mysql root user pass] **************************************** 
changed: [morpheus]
```
As expected. Ok.

---

Running playbook a second time without setting the env passwd, I get:

```
TASK: [Configure mysql root user pass] **************************************** 
failed: [morpheus] => {"failed": true, "item": ""}
msg: unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials
...ignoring
```

As expected. Ok.

---

Running playbook a second time setting the env passwd, in other words, in order to update/change password, I get:

```
TASK: [Configure mysql root user pass] **************************************** 
failed: [morpheus] => {"failed": true, "item": ""}
msg: unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials
...ignoring
```

Fails.