Description of problem:

Provisioning hosts and defining a host_parameters_attributes do not use them in templates

How reproducible:

Is this issue a regression from an earlier version:

Steps to Reproduce:

1. Configure the Satellite with the foreman-proxy features: tftp, templates, and httpboot

2. Configure the domain and subnet

3. Enable/Sync RHEL repositories (rpms, kickstart)
4. Create a new host via API, and define 'host_parameters_attributes' ("host_parameters_attributes":[\{"name":"default_grub_install_entry","parameter_type":"string","value":"1"}])

Actual behavior:
The host cannot see the host parameter values in templates that are deployed as 'Kickstart default PXEGrub2' in the '/var/lib/tftpboot/grub2/grub.cfg-<mac>' directory

Expected behavior:
The templates deploy the host parameter values properly

Business Impact / Additional info:

Medium