Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1119899
Description of problem:
When attempting to provision a new host on RHEVM, on the virtual machine tab, initially the network list for a NIC is empty. If you attempt to submit with an empty network selection, you will get an error that says the network is missing. When you return to the virtual machines tab, the networks are now listed.

Version-Release number of selected component (if applicable):
foreman-1.6.0.21-1.el6sat.noarch
foreman-compute-1.6.0.21-1.el6sat.noarch
foreman-gce-1.6.0.21-1.el6sat.noarch
foreman-libvirt-1.6.0.21-1.el6sat.noarch
foreman-ovirt-1.6.0.21-1.el6sat.noarch
foreman-postgresql-1.6.0.21-1.el6sat.noarch
foreman-proxy-1.6.0.9-1.el6sat.noarch
foreman-selinux-1.6.0-5.el6sat.noarch
foreman-vmware-1.6.0.21-1.el6sat.noarch
katello-1.5.0-26.el6sat.noarch
katello-ca-1.0-1.noarch
katello-certs-tools-1.5.5-1.el6sat.noarch
katello-installer-0.0.53-1.el6sat.noarch
pulp-katello-0.3-3.el6sat.noarch
ruby193-rubygem-foreman_bootdisk-2.0.6-1.1.el6sat.noarch
ruby193-rubygem-foreman_discovery-1.3.0-0.1.rc2.el6sat.noarch
ruby193-rubygem-foreman_hooks-0.3.5-2.el6sat.noarch
ruby193-rubygem-foreman-redhat_access-0.0.4-1.el6sat.noarch
ruby193-rubygem-foreman-tasks-0.6.3-2.el6sat.noarch
ruby193-rubygem-katello-1.5.0-65.el6sat.noarch
rubygem-hammer_cli_foreman-0.1.1-9.el6sat.noarch
rubygem-hammer_cli_foreman_tasks-0.0.3-2.el6sat.noarch
rubygem-hammer_cli_katello-0.0.4-7.el6sat.noarch

Additional info:

The very first time we attempted to provision a new host, the networks were listed. I canceled out of this first attempt without submitting anything. Forever after we seem to have this issue.