Bug 1588650

Description of problem
======================

*Import Cluster* wizard shows list of "Discovered Host(s)" with an option
to filter machines there. The text states:

> Review the hosts for the and click Import to monitor this cluster.

This is a good way to check if one tries to import
the correct cluster (eg. making sure that one particular machine or subset
of machines is present), but it has no effect on the actual import itself.

The problem is that the when the filter returns no results and no hosts are
displayed, the import button is missing.

This could make someone to think that this filtering has some effect on the
import (eg. that it's possible to import just a subset of a trusted storage
pool by using the filter feature here).

Version-Release number
======================

tendrl-ui-1.6.3-3.el7rhgs.noarch

Other RHGS WA components on the server machine:

```
# rpm -qa | grep tendrl | sort
tendrl-ansible-1.6.3-4.el7rhgs.noarch
tendrl-api-1.6.3-3.el7rhgs.noarch
tendrl-api-httpd-1.6.3-3.el7rhgs.noarch
tendrl-commons-1.6.3-6.el7rhgs.noarch
tendrl-grafana-plugins-1.6.3-4.el7rhgs.noarch
tendrl-grafana-selinux-1.5.4-2.el7rhgs.noarch
tendrl-monitoring-integration-1.6.3-4.el7rhgs.noarch
tendrl-node-agent-1.6.3-6.el7rhgs.noarch
tendrl-notifier-1.6.3-3.el7rhgs.noarch
tendrl-selinux-1.5.4-2.el7rhgs.noarch
tendrl-ui-1.6.3-3.el7rhgs.noarch
```

How reproducible
================

100 %

Steps to Reproduce
==================

1. Prepare gluster trusted storage pool
2. Install RHGS WA using tendrl-ansible
3. Log into the WA web ui and click import
4. Try filtering hosts in Discovered Host(s) section so that no results
   would be shown

Actual results
==============

Instead of list of hosts, "No Hosts Detected" is shown.

The import and Cancel buttons are not visible, so that one can't start import.

Expected results
================

Instead of list of hosts, "No Hosts Detected" is shown.

Import and Cancel buttons are still accessible.

Additional info
===============

Do we need to tweak the text a bit, eg. making it more clear or moving it
around? I have no particular opinion there.

The fact that the host selection is not passed further could be checked by
inspecting http requests during import. Using firefox inspector, I see:

```
POST http://mbukatov-usm1-server.example.com/api/1.0/clusters/84ffce52-031b-415f-a8a0-c878043dfd89/import

Headers:
Host: mbukatov-usm1-server.example.com
User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: application/json, text/plain, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://mbukatov-usm1-server.usmqe.lab.eng.brq.redhat.com/
Authorization: Bearer b792589aefab9061fe0181fbef13f98a3ba9b000d07ae48b56d3fa8a5bbe6363
Content-Length: 89
Content-Type: text/plain;charset=UTF-8
Connection: keep-alive

Body:
{"Cluster.volume_profiling_flag":"leave-as-is","Cluster.short_name":"cluster_2018_06_07"}
```

Related Design Document:

https://redhat.invisionapp.com/share/8QCOEVEY9#/screens/247445416