Description of problem:
rhui-manager in RHUI v2 provides 'status' sub command to show the status
summary of the whole RHUI system but it seems that rhui-manager does
not provide it any more in RHUI v3 Beta 1.

It's a kind of regression for many customers depend on that function for
daily monitoring and health checks.



Version-Release number of selected component (if applicable):
RHUI 3.0 Beta.1


How reproducible: Always

Steps to Reproduce:
1. run 'rhui-manager status'

Actual results:
The interactive shell of rhui-manager is started.


Expected results:
The status overview of the whole RHUI system is shown.


Additional info:
If it's difficult or takes a long time to implement this into rhui-manager,
a kind of script running a bunch of commands (pulp-admin, rhui, etc.)
may be enough, for example:

------------------------------------------------------------------------
#! /bin/bash
# installed as /usr/sbin/rhui-status or something alike.
set -e

pulp-admin login -u admin -p <passwd>

# cds access
for cds in cds_names; do
curl --connect-timeout --cacert /etc/pki/rhui/ca.crt --cert /etc/pki/rhui/product/content.crt \
  --key /etc/pki/rhui/key.pem https://${cds}/pulp/mirror/content/dist/rhel/rhui/server/.../ # url of a repo.
done

# cert
... # do.

# status of last sync of rpm repos
for r in $(pulp-admin rpm repo list --fields id | sed -nr 's/^Id: (.+)/\1/p')
do
    pulp-admin repo history sync --repo-id $r --limit 1
done
------------------------------------------------------------------------