Description of problem:

Could not create host via hammer.

[ERROR 2019-06-03T03:19:15 API] 422 Unprocessable Entity
[DEBUG 2019-06-03T03:19:15 API] {
    "errors" => {
                   "conflict" => [],
        "interfaces.conflict" => [],
                       "base" => [
            [0] "Cleanup PuppetCA certificates for test.example.com task failed with the following error: ERF12-7740 [ProxyAPI::ProxyException]: Unable to delete PuppetCA certificate for test.example.com ([RestClient::NotAcceptable]: 406 Not Acceptable) for Capsule https://qe-sat6-feature-example.com:9090/puppet/ca"
        ]
    }
}
[DEBUG 2019-06-03T03:19:15 Exception] Using exception handler HammerCLIForeman::ExceptionHandler#handle_unprocessable_entity
[ERROR 2019-06-03T03:19:15 Exception] <NilClass> nil
Could not create the host


Version-Release number of selected component (if applicable):
Satellite 6.6 snap 4


How reproducible: always


Steps to Reproduce:
1. # hammer hostgroup info --organization-id=1 --location-id=2 --name="RHEL 7 Server 64-bit HG"Id:                    2
Name:                  RHEL 7 Server 64-bit HG
Title:                 RHEL 7 Server 64-bit HG
Puppet Environment:    production
Puppet CA Proxy:       qe-sat6-feature-example.com
Puppet Master Proxy:   qe-sat6-feature-example.com
Network:               
    Subnet ipv4: katello_latest
    Domain:      example.com
Operating system:      
    Architecture:     x86_64
    Operating System: RedHat 7.6
    Partition Table:  Kickstart default
    PXE Loader:       PXELinux BIOS
Puppetclasses:         
    access_insights_client
    foreman_scap_client
Parameters:            
    kt_activation_keys => ak-rhel-7
Locations:             
    Default Location
Organizations:         
    Default Organization
OpenSCAP Proxy:        
Content View:          
    ID:   2
    Name: RHEL 7 CV
Lifecycle Environment: 
    ID:   2
    Name: DEV
Content Source:        
    ID:   1
    Name: qe-sat6-feature-example.com
Kickstart Repository:  
    ID:   19
    Name: 19


2. hammer --debug host create --name=test --root-password='changeme' --organization-id=1 --location-id=2 --hostgroup="RHEL 7 Server 64-bit HG" --compute-resource='libvirt' --compute-attributes="cpus=1, memory=1073741824, start=1" --interface="primary=true, compute_type=bridge, compute_bridge=katello_latest, compute_model=virtio" --volume="capacity=10G,format_type=qcow2"

Actual results:

Hammer throws error as "Could not create the host" but when you see in UI, it is successfully created.


Expected results:

Hammer should not throw error.


Additional info: Regression.