Description of problem:
During deployment, verification is missing for wrong NFS path.
The deployment is not checking for correct NFS path and trying to proceed with incorrect values without checking, then fails.
Deployment should check for the correct path and if its fine, only then proceed with the deployment, otherwise to warn customer that provided path is incorrect.

[ INFO  ] TASK [Check host status]
[ INFO  ] skipping: [localhost]
[ INFO  ] TASK [Remove host-deploy configuration file]
[ INFO  ] changed: [localhost]
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: 
          Please specify the nfs version you would like to use (auto, v3, v4, v4_1)[auto]: 
          Please specify the full shared storage connection path to use (example: host:/path): Works for me on these components:
ovirt-hosted-engine-ha-2.2.7-1.el7ev.noarch
ovirt-hosted-engine-setup-2.2.13-1.el7ev.noarch
rhvm-appliance-4.2-20180202.0.el7.noarch
Linux 3.10.0-861.el7.x86_64 #1 SMP Wed Mar 14 10:21:01 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux
Red Hat Enterprise Linux Server release 7.5 (Maipo)
Deployed over iSCSI.          If needed, specify additional mount options for the connection to the hosted-engine storagedomain []: [ INFO  ] Creating Storage Domain
[ INFO  ] TASK [Gathering Facts]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [include_tasks]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Obtain SSO token using username/password credentials]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Fetch host facts]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Fetch cluster id]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Fetch cluster facts]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Fetch datacenter facts]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Fetch datacenter id]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Fetch datacenter_name]
[ INFO  ] ok: [localhost]
[ INFO  ] TASK [Add nfs storage domain]
[ ERROR ] Error: Fault reason is "Incomplete parameters". Fault detail is "HostStorage [path] required for add". HTTP response code is 400.
[ ERROR ] fatal: [localhost]: FAILED! => {"changed": false, "msg": "Fault reason is \"Incomplete parameters\". Fault detail is \"HostStorage [path] required for add\". HTTP response code is 400."}
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: [ ERROR ] Invalid value
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: [ ERROR ] Invalid value
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: [ ERROR ] Invalid value
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: [ ERROR ] Invalid value
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: yellow-vdsb.qa.lab.tlv.redhat.com:/Compute_NFS/nsednev_he_2
[ ERROR ] Invalid value
          Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs)[nfs]: 


Version-Release number of selected component (if applicable):
ovirt-hosted-engine-ha-2.2.7-1.el7ev.noarch
ovirt-hosted-engine-setup-2.2.13-1.el7ev.noarch
rhvm-appliance-4.2-20180202.0.el7.noarch
Linux 3.10.0-861.el7.x86_64 #1 SMP Wed Mar 14 10:21:01 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux
Red Hat Enterprise Linux Server release 7.5 (Maipo)
Deployed over iSCSI.          

How reproducible:
100%

Steps to Reproduce:
1.Deploy SHE over NFS and provide incorrect NFS path.

Actual results:
Deployment proceeds without any verification ov values.
 
Expected results:
The verification is missing.