Use first_master_client_binary from hostvars[groups.oo_first_master.0]

[michaelgugino]

Since first_master_client_binary is initialized in oo_first_master, it
should be collected from oo_first_master.0. This patch changes to use
first_master_client_binary from hostvars[groups.oo_first_master.0] on
GlusterFS cluster health task.

(cherry picked from commit b726dda)

Backports: #9924
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1636018

[vrutkovs]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

Approval requirements bypassed by manually added approval.

This pull-request has been approved by: michaelgugino, vrutkovs

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[michaelgugino]

/test gcp

[openshift-ci-robot]

@michaelgugino: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/gcp	077c801	link	/test gcp

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.