Description of problem:

Parameter inheritance is not functional for the 'kernelcmd' parameter.

For example, if we set 'kernelcmd=ipv6.disable=1' on the parent host group, and 'kernelcmd=nouveau.modeset=0 rd.driver.blacklist=nouveau' on the child host group, we should end up with 'kernelcmd=ipv6.disable=1  nouveau.modeset=0 rd.driver.blacklist=nouveau' on the host associated with the child host group.

How reproducible:

Always

Is this issue a regression from an earlier version:

No.

Steps to Reproduce:

1. Set 'kernelcmd=ipv6.disable=1' on the parent host group.

2. Set 'kernelcmd=nouveau.modeset=0 rd.driver.blacklist=nouveau' on the child host group.

3. Provision a host associated with the child host group.

Actual behavior:
Parameter inheritance is not functional for the 'kernelcmd' parameter.

Expected behavior:
We should end up with 'kernelcmd=ipv6.disable=1  nouveau.modeset=0 rd.driver.blacklist=nouveau' on the host associated with the child host group.

Business Impact / Additional info: