Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1274683

Description of problem:
I want to create and update hosts using hammer host create/update and pass custom parameters to it. This works fine on create but fails when I want to update a host and pass a parameter that is already present.

Version-Release number of selected component (if applicable):
foreman 1.13
hammer 0.8.0
hammer_cli_foreman 0.8.0

How reproducible:
always

Steps to Reproduce:
1. hammer host create ... --parameters="foo=bar"
2. hammer host update ... --parameters="foo=bar"

Actual results:

Could not update the host:
  Name has already been taken

Expected results:
Host updated

Additional info:
It does not matter if I want to set the parameter to the same or a new value.