ocp4: Enhance group ownership checks openvswitch processes pid files

[JAORMX]

In a more recent version of Open vSwitch, the process pid files changed
ownership from "openvswitch" to "hugetlbfs". OCP 4.6 will stay in an
older version of OvS, so to keep this working with newer versions (e.g.
the one included in OCP 4.8), this fixes the content to check for both
groups. This way the content keeps being valid accross releases.

Closes #6913

Signed-off-by: Juan Antonio Osorio Robles jaosorior@redhat.com

[openscap-ci]

Changes identified:
Rules:
 file_groupowner_ovs_pid
 file_groupowner_ovs_vswitchd_pid
 file_groupowner_ovsdb_server_pid

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Rule file_groupowner_ovs_pid:
 OVAL check is newly added.
Rule file_groupowner_ovs_vswitchd_pid:
 OVAL check is newly added.
Rule file_groupowner_ovsdb_server_pid:
 OVAL check is newly added.

Recommended tests to execute:
 build_product ocp4
 tests/test_suite.py rule --libvirt qemu:///system test-suite-vm --remediate-using bash --datastream build/ssg-ocp4-ds.xml file_groupowner_ovs_pid
 tests/test_suite.py rule --libvirt qemu:///system test-suite-vm --remediate-using bash --datastream build/ssg-ocp4-ds.xml file_groupowner_ovs_vswitchd_pid
 tests/test_suite.py rule --libvirt qemu:///system test-suite-vm --remediate-using bash --datastream build/ssg-ocp4-ds.xml file_groupowner_ovsdb_server_pid