Add role management

[AlanCoding]

Example command:

$ tower-cli role grant --user new_user --credential pi --type admin
== ==== ===== ========== 
id user type  credential 
== ==== ===== ========== 
62   10 admin          2
== ==== ===== ========== 

[jangsutsr]

Manually tested in sequence:

(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role list --user 2 -v --insecure
*** DETAILS: Getting records. *************************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/roles/
Params: {'members__in': 2, u'page': 1}

== ====== ============= ============= 
id  type  resource_name resource_type 
== ====== ============= ============= 
28 Admin  role          user
 4 Member Default       organization
== ====== ============= ============= 
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role grant --user 2 --inventory 1 --type use -v --insecure
*** DETAILS: Checking if role exists. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'role_field': 'use_role'}

*** DETAILS: Checking if user already has role. *******************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'members__in': 2, 'role_field': 'use_role'}

*** DETAILS: Attempting to add the user from this role. ***********************
POST https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/users/2/roles/
Data: {'id': 18}

== ==== ==== ========= 
id user type inventory 
== ==== ==== ========= 
18    2 use          1
== ==== ==== ========= 
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role grant --user 2 --inventory 1 --type use -v --insecure
*** DETAILS: Checking if role exists. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'role_field': 'use_role'}

*** DETAILS: Checking if user already has role. *******************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'members__in': 2, 'role_field': 'use_role'}

*** DECISION: This user is already a member of the role. **********************
== ==== ==== ========= 
id user type inventory 
== ==== ==== ========= 
18    2 use          1
== ==== ==== ========= 
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role grant --user 2 --inventory 1 --type auditor -v --insecure
*** DETAILS: Checking if role exists. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'role_field': 'auditor_role'}

Error: The requested object could not be found.
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role revoke --user 2 --inventory 1 --type use -v --insecure
*** DETAILS: Checking if role exists. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'role_field': 'use_role'}

*** DETAILS: Checking if user already has role. *******************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'members__in': 2, 'role_field': 'use_role'}

*** DETAILS: Attempting to remove the user from this role. ********************
POST https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/users/2/roles/
Data: {'id': 18, 'disassociate': True}

== ==== ==== ========= 
id user type inventory 
== ==== ==== ========= 
18    2 use          1
== ==== ==== ========= 
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role revoke --user 2 --inventory 1 --type use -v --insecure
*** DETAILS: Checking if role exists. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'role_field': 'use_role'}

*** DETAILS: Checking if user already has role. *******************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/inventories/1/object_roles/
Params: {'members__in': 2, 'role_field': 'use_role'}

*** DECISION: This user is already a non-member of the role. ******************
== ==== ==== ========= 
id user type inventory 
== ==== ==== ========= 
18    2 use          1
== ==== ==== ========= 
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role get 18 -v --insecure
*** DETAILS: Getting the role record. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/roles/18/
Params: {}

== ==== ============== ============= 
id type resource_name  resource_type 
== ==== ============== ============= 
18 Use  Demo Inventory inventory
== ==== ============== ============= 
(tower_cli_devel) sitan-OSX:tower-cli sitan$ tower-cli role get --user 2 -v --insecure
*** DETAILS: Getting the role record. *****************************************
GET https://ec2-54-234-179-218.compute-1.amazonaws.com/api/v1/roles/
Params: {'members__in': 2}

Error: Expected one result, got 2. Tighten your criteria.

Everything works as described in doc/help-text. Great Job! 👍

[coveralls]

Coverage decreased (-0.1%) to 99.079% when pulling 76888ff on AlanCoding:roles into bb0e52e on ansible:master.

[coveralls]

Coverage increased (+0.08%) to 99.252% when pulling 601acee on AlanCoding:roles into bb0e52e on ansible:master.

[coveralls]

Coverage decreased (-0.1%) to 99.079% when pulling 60c6c58 on AlanCoding:roles into 1270bdd on ansible:master.

[coveralls]

Coverage increased (+0.08%) to 99.252% when pulling 60c6c58 on AlanCoding:roles into 1270bdd on ansible:master.