Description of problem:
Fence agent fence_rhevm is using the old API which will be deprecated on newer
versions of oVirt/RHV

Version-Release number of selected component (if applicable):
git.1537269352.7b1fd536-lp151.1.2.x86_64

How reproducible:
Always

Steps to Reproduce:
1.Configure a fence agent on openSUSE 15.1 system:
primitive fencing stonith:fence_rhevm \
        params ipaddr=ovirt-engine.localdomain ipport=443 ssl_insecure=1 ssl=1
login="cluster@internal" passwd="lrm://" pcmk_host_map="node1:node1 node2:node2
node3:node3" pcmk_host_check=static-list pcmk_host_list="node1 node2 node3"
power_wait=3 \
        op monitor interval=90s

2. Fence a node:
crm node fence node2
3.Get a warning in oVirt (4.3.4) as follows:

Client from address "192.168.1.38" is using version 3 of the API, which has
been deprecated since version 4.0 of the engine, and will no longer be
supported starting with version 4.3. It is highly recommended to update the
client to use a supported version of the API and the SDKs, before upgrading to
version 4.3 of the engine.

Actual results:
Old API is used , which will soon be completely unusable.

Expected results:
A newer version of the API to be used.

Additional info:
RHEL systems do not produce such warning.