Hammer CLI

Description of problem:

Commands hammer subnet create/update contain option --subnet-parameters-attributes that is generated automatically from apidoc. The option should be removed and replaced with set-parameter and delete-parameter commands as how it's done for other resources that have parameters (eg. domains).

Version-Release number of selected component (if applicable):
foreman 1.14
hammer-cli-foreman 0.9.0

Steps to Reproduce:
1. run: hammer subnet create -h
2. run: hammer subnet update -h

Actual results:
Help output for the both commands contain option --subnet-parameters-attributes

Expected results:
The option should be removed and there should be two new commands:
hammer subnet set-parameter
hammer subnet delete-parameter