Description of problem:
If the url of ansible repository was changed, then list of playbooks remains the same

Version-Release number of selected component (if applicable):
5.8.0.12-rc1.20170425180304_4f35996 

How reproducible:
Always

Steps to Reproduce:
1. Enable Embedded Ansible role.
2. Wait until it will be enabled.
3. Add some repository with ansible playbook.
4. Change the repository url.
5. Navigate to Automation/Ansible/Playbooks.

Actual results:
Playbooks remain the same.

Expected results:
Playbooks list should be changed and show respectful items.

Additional info:
[----] E, [2017-05-02T06:35:07.638884 #2942:d3f130] ERROR -- : [NoMethodError]: undefined method `href=' for #<AnsibleTowerClient::Project:0x0000000d054f30>  Method:[rescue in deliver]
[----] E, [2017-05-02T06:35:07.638966 #2942:d3f130] ERROR -- : /opt/rh/cfme-gemset/gems/ansible_tower_client-0.12.1/lib/ansible_tower_client/base_model.rb:88:in `block in update_attributes!'
/opt/rh/cfme-gemset/gems/ansible_tower_client-0.12.1/lib/ansible_tower_client/base_model.rb:84:in `each'
/opt/rh/cfme-gemset/gems/ansible_tower_client-0.12.1/lib/ansible_tower_client/base_model.rb:84:in `update_attributes!'
/var/www/miq/vmdb/app/models/manageiq/providers/ansible_tower/shared/automation_manager/tower_api.rb:67:in `block in update_in_provider'
/var/www/miq/vmdb/app/models/mixins/provider_object_mixin.rb:15:in `block in with_provider_object'
/var/www/miq/vmdb/app/models/provider.rb:49:in `with_provider_connection'
/var/www/miq/vmdb/app/models/manageiq/providers/ansible_tower/shared/automation_manager.rb:5:in `with_provider_connection'
/var/www/miq/vmdb/app/models/mixins/provider_object_mixin.rb:12:in `with_provider_object'
/var/www/miq/vmdb/app/models/manageiq/providers/ansible_tower/shared/automation_manager/tower_api.rb:66:in `update_in_provider'
/var/www/miq/vmdb/app/models/miq_queue.rb:347:in `block in deliver'
/opt/rh/rh-ruby23/root/usr/share/ruby/timeout.rb:91:in `block in timeout'
/opt/rh/rh-ruby23/root/usr/share/ruby/timeout.rb:33:in `block in catch'
/opt/rh/rh-ruby23/root/usr/share/ruby/timeout.rb:33:in `catch'
/opt/rh/rh-ruby23/root/usr/share/ruby/timeout.rb:33:in `catch'
/opt/rh/rh-ruby23/root/usr/share/ruby/timeout.rb:106:in `timeout'
/var/www/miq/vmdb/app/models/miq_queue.rb:343:in `deliver'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:107:in `deliver_queue_message'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:135:in `deliver_message'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:153:in `block in do_work'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:147:in `loop'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:147:in `do_work'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:336:in `block in do_work_loop'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:333:in `loop'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:333:in `do_work_loop'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:155:in `run'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:130:in `start'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:21:in `start_worker'
/var/www/miq/vmdb/app/models/miq_worker.rb:339:in `block in start_runner'
/opt/rh/cfme-gemset/gems/nakayoshi_fork-0.0.3/lib/nakayoshi_fork.rb:24:in `fork'
/opt/rh/cfme-gemset/gems/nakayoshi_fork-0.0.3/lib/nakayoshi_fork.rb:24:in `fork'
/var/www/miq/vmdb/app/models/miq_worker.rb:337:in `start_runner'
/var/www/miq/vmdb/app/models/miq_worker.rb:348:in `start'
/var/www/miq/vmdb/app/models/miq_worker.rb:266:in `start_worker'
/var/www/miq/vmdb/app/models/miq_worker.rb:150:in `block in sync_workers'
/var/www/miq/vmdb/app/models/miq_worker.rb:150:in `times'
/var/www/miq/vmdb/app/models/miq_worker.rb:150:in `sync_workers'
/var/www/miq/vmdb/app/models/miq_server/worker_management/monitor.rb:53:in `block in sync_workers'
/var/www/miq/vmdb/app/models/miq_server/worker_management/monitor.rb:50:in `each'
/var/www/miq/vmdb/app/models/miq_server/worker_management/monitor.rb:50:in `sync_workers'
/var/www/miq/vmdb/app/models/miq_server.rb:160:in `start'
/var/www/miq/vmdb/app/models/miq_server.rb:251:in `start'
/var/www/miq/vmdb/lib/workers/evm_server.rb:65:in `start'
/var/www/miq/vmdb/lib/workers/evm_server.rb:91:in `start'
/var/www/miq/vmdb/lib/workers/bin/evm_server.rb:4:in `<main>'