i upgraded to 1.19 RC in order to get native Ubuntu 18.04 support

since that upgrade Vmware create operations (new host or clone existing) have been failing with errors like:

Could not find virtual machine network interface matching ens192

or

Could not find virtual machine network interface matching x.x.x.x

enabled debug logging and here is the relevant section of the log where failure occurs (indentifable info has been sanitized)

2018-08-21T14:12:58 [D|app|8843e] Processing task 'Query instance details for prod-ocs-diam-a.example.com' from 'Host::Managed Main'
2018-08-21T14:12:58 [D|app|8843e] Orchestration::Compute: Trying to match network interfaces from fog   <Fog::Compute::Vsphere::Interfaces
 |     server_id="5002c6e4-a608-c268-6269-617b4f28ac30" 
 |     [
 |                   <Fog::Compute::Vsphere::Interface
 |         mac="00:50:56:82:ee:c9",
 |         network="dvportgroup-707",
 |         name="Network adapter 1",
 |         status="untried",
 |         connected=false,
 |         summary="DVSwitch: 50 02 4a ee 11 19 09 f4-b9 69 08 e3 b9 44 6c 29",
 |         type=RbVmomi::VIM::VirtualVmxnet3,
 |         key=4000,
 |         virtualswitch=nil,
 |         server_id="5002c6e4-a608-c268-6269-617b4f28ac30" 
 |       >,
 |                   <Fog::Compute::Vsphere::Interface
 |         mac="00:50:56:82:4b:99",
 |         network="dvportgroup-405",
 |         name="Network adapter 2",
 |         status="untried",
 |         connected=false,
 |         summary="DVSwitch: 50 02 4a ee 11 19 09 f4-b9 69 08 e3 b9 44 6c 29",
 |         type=RbVmomi::VIM::VirtualVmxnet3,
 |         key=4001,
 |         virtualswitch=nil,
 |         server_id="5002c6e4-a608-c268-6269-617b4f28ac30" 
 |       >
 |     ]
 |   >
2018-08-21T14:12:58 [W|app|8843e] Orchestration::Compute: Could not match network interface #<Nic::Managed id: nil, mac: nil, ip: "x.x.x.x", type: "Nic::Managed", name: "prod-ocs-diam-a.example.com", host_id: nil, subnet_id: 10, domain_id: 6, attrs: {}, created_at: nil, updated_at: nil, provider: nil, username: nil, password: nil, virtual: false, link: true, identifier: "ens192", tag: "", attached_to: "", managed: true, mode: "balance-rr", attached_devices: "", bond_options: "", primary: true, provision: true, compute_attributes: {"type"=>"VirtualVmxnet3", "network"=>"dvportgroup-707"}, ip6: "", subnet6_id: nil>
2018-08-21T14:12:58 [W|app|8843e] Could not find virtual machine network interface matching ens192
2018-08-21T14:12:58 [W|app|8843e] Rolling back due to a problem: [#<Orchestration::Task:0x000055febf6cd540 @name="Query instance details for prod-ocs-diam-a.example.com", @id="Query instance details for prod-ocs-diam-a.example.com", @status="failed", @priority=4, @action=[#<Host::Managed id: nil, name: "prod-ocs-diam-a.example.com", last_compile: nil, last_report: nil, updated_at: nil, created_at: nil, root_pass: "XXXX", architecture_id: 1, operatingsystem_id: 3, environment_id: 1, ptable_id: 92, medium_id: 7, build: true, comment: "", disk: "", installed_at: nil, model_id: nil, hostgroup_id: 4, owner_id: 4, owner_type: "User", enabled: true, puppet_ca_proxy_id: 1, managed: true, use_image: nil, image_file: nil, uuid: "5002c6e4-a608-c268-6269-617b4f28ac30", compute_resource_id: 3, puppet_proxy_id: 1, certname: nil, image_id: nil, organization_id: nil, location_id: nil, type: "Host::Managed", otp: nil, realm_id: nil, compute_profile_id: 4, provision_method: "build", grub_pass: "XXXXXX", global_status: 0, lookup_value_matcher: "fqdn=prod-ocs-diam-a.example.com", pxe_loader: "PXELinux BIOS", initiated_at: nil, build_errors: nil>, :setComputeDetails], @created=1534853560.2990792, @timestamp=2018-08-21 12:12:58 UTC>]
2018-08-21T14:12:58 [I|app|8843e] Removing Compute instance for prod-ocs-diam-a.example.com