change parameter of findmnt used in bash partition conditional

[vojtapolasek]

Description:

• in the bash partition conditional, change findmnt --mountpoint for findmnt --kernel.

Rationale:

• in RHEL7, the findmnt commant does not support the --mountpoint option. I chose the kernel option because we are interested in partitions which are mounted at the time of remediation.
• Fixes Rules using the mount_option template fail tests scenarios on RHEL 7 #9445

[github-actions]

Start a new ephemeral environment with changes proposed in this pull request:

Fedora Environment

Oracle Linux 8 Environment

[codeclimate]

Code Climate has analyzed commit 6a25b61 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 40.4% (0.0% change).

View more on Code Climate.

[openshift-ci]

@vojtapolasek: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-rhcos4-high	6a25b61	link	true	/test e2e-aws-rhcos4-high
ci/prow/e2e-aws-rhcos4-moderate	6a25b61	link	true	/test e2e-aws-rhcos4-moderate
ci/prow/e2e-aws-ocp4-stig-node	6a25b61	link	true	/test e2e-aws-ocp4-stig-node
ci/prow/e2e-aws-ocp4-high-node	6a25b61	link	true	/test e2e-aws-ocp4-high-node

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