Description of problem:

When assigning ansible roles while creating a host via hammer with "--ansible-roles" option, all available roles in satellite are assigned to the system


Version-Release number of selected component (if applicable):
6.4
6.5

How reproducible:
Always

Steps to Reproduce:

1. Import some ansible roles in satellite and assign while creating a host with 
hammer

# hammer host create --ansible-roles test --name client --hostgroup RHEL7 --location city --organization Example
 
In background, it calls following API to get role IDs but it gives result containing all ansible roles :
---------------------------------
/ansible/api/ansible_roles?name=test"
---------------------------------

API SHould have been : 

---------------------------------
/ansible/api/ansible_roles?search=name=test"
---------------------------------


Actual results:
All roles in satellite are assigned to the system

Expected results:

Only roles which are passed in the hammer command should be assigned

Additional info:

Behaviour is same with "hammer host update --ansible-roles" also