Description of problem:
Canceling REX tasks doesn't work with organization/ location scope even though help string say so.

Version-Release number of selected component (if applicable):
rubygem-foreman_maintain-0.4.4-1.el7sat.noarch

How reproducible:
always

Steps to Reproduce:
1. Schedule a future task on a remote host using org/loc tag
2. Determines task should not be executed and would like to remove it using org/loc tag.

Actual results:
Job can't be canceled.

Expected results:
Job is canceled. Or loc/org tag is removed from possible options.

Additional info:
# hammer job-invocation cancel --help
Usage:
    hammer job-invocation cancel [OPTIONS]

Options:
 --force FORCE                     One of true/false, yes/no, 1/0.
 --id ID                            
 --location-id LOCATION_ID         Scope by locations
 --organization-id ORGANIZATION_ID Scope by organizations
 -h, --help                        Print help

# hammer -v job-invocation create --start-at "$(date --utc +'%Y-%m-%d %H:%M:%S' -d 'now +5 min')" --job-template "Run Command - SSH Default" --search-query "name = helpful-snipe.lxd" --inputs command="ls -la /" --organization-id 1
Job invocation 14 created

# hammer job-invocation list
---|--------------------------------|-----------|---------|--------|---------|-------|------------------------
ID | DESCRIPTION                    | STATUS    | SUCCESS | FAILED | PENDING | TOTAL | START                  
---|--------------------------------|-----------|---------|--------|---------|-------|------------------------
14 | Run ls -la /                   | queued    | N/A     | N/A    | N/A     | N/A   | 2019-07-09 12:10:00 UTC

# hammer job-invocation cancel --id 14 --organization-id 1
Could not cancel the job invocation:
  ERF42-5227 [Foreman::Exception]: unknown parent permission for api/v2/job_invocations#cancel