Improve agents management

[sorobon]

Prerequisites

• [ X] Put an X between the brackets on this line if you have done all of the following:
  • Checked that your issue isn't already filled: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aidealista
  • Checked that there is not already provided the described functionality

Description

When you run the role twice it will download and configure the agent every run.

Steps to Reproduce

1. [First Step]
2. [Second Step]
3. [and so on...]

Expected behavior: Only do things when its necessary.

Actual behavior: Download and configure the agent every time.

Reproduces how often: Always

Versions

Since 1.5.x

Additional Information

Any additional information, configuration or data that might be necessary to reproduce the issue.