Drop RHEL 7 from primary targets.

RHEL 8 is still at 8.3 but this is about to change by the time 4.20 is
closer to release.

Change-Id: Ic5789bec9cc09b1861a0f864bb4b72d62cbcc17e
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
1 file changed