Fixes #5569 - support --name for repository-set available-repositories
fixes #5192 - rename system-group to host-collection

This commit contains a small change to rename the system group
command to host collection.

This commit contains a small change to rename the system group
command to host collections
update README to also pull down hammer-cli-foreman-tasks
fixes #5600 - fix host-collection copy command

The command was missing the arguments/parameters; therefore,
user couldn't actually copy a host collection.
refs #5028 - organizations aren't a special case anymore
fixes #5602 - host-collections: add command to list content-hosts

Added a list command to show the list of content-hosts in a
host-collection. E.g.

hammer> host-collection content-hosts --id 1
---|--------------------------------------|-----------------
ID | UUID                                 | NAME
---|--------------------------------------|-----------------
9  | 054925b5-2046-494d-afe8-8b56dc5a5596 | sat6client.devel
---|--------------------------------------|-----------------
fixes #5601, #5603 - host-collections: add support for update and add/remove-content-host

This commits add support for the following commands:

host-collection update
host-collection add-content-host
host-collection remove-content-host
Fixes #5613 - Content Hosts outputs uuid bz1084722

Content hosts will now ouput uuid instead of id to align the input for
the commands to the output of the commands.
Fixes #5730 - Enable searching in ContentHostTasks

This fixes the use of seaching in the Task subcommand for ContentHost.
Command previously, did not list --name as a valid parameter and did not
try to search for the resource.