Description of problem: After modifying variable required_root_free_space, satellite still complain about less space and error message is misleading

TASK [satellite-clone : debug] ************************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": "Free space in root partition is 40.045805568GB and required free space is atleast 35GB. ***NOTE:*** If you have more pulp data, it is your responsibility to check for the required free space.  Perhaps you can increase the required_root_free_space variable to a desired high value."
}


How reproducible: Always


Steps to Reproduce:
1. Make sure disk space is less than 75 GB, after running satellite-clone, It raise error message for less disk space as given below

TASK [satellite-clone : debug] ************************************************************************************************************************************************************************************
Friday 08 December 2017  06:44:51 +0530 (0:00:00.083)       0:00:04.900 ******* 
ok: [localhost] => {
    "msg": "Free space in root partition is 32.03147776GB and required free space is atleast 75GB. ***NOTE:*** If you have more pulp data, it is your responsibility to check for the required free space.  Perhaps you can increase the required_root_free_space variable to a desired high value."
}

2. Now free some space and
Open /usr/share/satellite-clone/satellite-clone-vars.yml and modify required_root_free_space to 35 

TASK [satellite-clone : debug] ************************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": "Free space in root partition is 40.045805568GB and required free space is atleast 35GB. ***NOTE:*** If you have more pulp data, it is your responsibility to check for the required free space.  Perhaps you can increase the required_root_free_space variable to a desired high value."
}


Actual results:
"Free space in root partition is 40.045805568GB and required free space is atleast 35GB"

Expected results: It should not raise error


Additional info: