Bug 1460669

Description of problem:
There are two connected problems at "configuration" page in wizard for creating ceph cluster.

1) Dashboard does not set properly dedicated journals in UI.
There is label "8 devices" but if user opens list of devices there is just one device for osd and one device for journal in the list. And there are just 6 devices on node:
$ lsblk 
NAME   MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda    253:0    0  20G  0 disk 
└─vda1 253:1    0  20G  0 part /
vdb    253:16   0  11G  0 disk 
vdc    253:32   0  11G  0 disk 
vdd    253:48   0  20G  0 disk 
vde    253:64   0  20G  0 disk 
vdf    253:80   0  20G  0 disk 
vdg    253:96   0  20G  0 disk 

2) Also it is possible to set more than 100 partitions per device.

Version-Release number of selected component (if applicable):
ceph-ansible-2.2.11-1.el7scon.noarch
ceph-installer-1.3.0-1.el7scon.noarch
etcd-3.1.7-1.el7.x86_64
python-etcd-0.4.5-1.noarch
rubygem-etcd-0.3.0-1.el7.noarch
tendrl-alerting-3.0-alpha.3.el7scon.noarch
tendrl-api-3.0-alpha.4.el7scon.noarch
tendrl-api-doc-3.0-alpha.4.el7scon.noarch
tendrl-api-httpd-3.0-alpha.4.el7scon.noarch
tendrl-commons-3.0-alpha.9.el7scon.noarch
tendrl-dashboard-3.0-alpha.4.el7scon.noarch
tendrl-node-agent-3.0-alpha.9.el7scon.noarch
tendrl-node-monitoring-3.0-alpha.5.el7scon.noarch
tendrl-performance-monitoring-3.0-alpha.7.el7scon.noarch


How reproducible:
100%

Steps to Reproduce:
1) 
1. check devices in UI for nodes

2)
1. user try to create ceph cluster
2. at journal "configuration" page is "Partitions per Device (Max = 2)"
3. go back to "general" page and change cluster name
4. go back to "configuration" page and there is "Partitions per Device (Max = 4)"
5. go back to "general" page and change cluster name
6. go back to "configuration" page and there is "Partitions per Device (Max = NaN)"
7. it is possible to set "Partitions per Device" to any number

Actual results:
There are 2 related bugs in UI described above.

Expected results:
Journals are set according rules described in documentation and in design documents.