EL8/9: Install iputils

Beaker assumes that the ping binary exists. in EL8 and EL9 that's
provided by iputils.

```
[root@pe ~]# dnf whatprovides /usr/sbin/ping
Fedora 40 - x86_64                                                                                                                                                                    23 MB/s |  56 MB     00:02
Fedora 40 openh264 (From Cisco) - x86_64                                                                                                                                             6.2 kB/s | 2.1 kB     00:00
Fedora 40 - x86_64 - Updates                                                                                                                                                          19 MB/s |  32 MB     00:01
iputils-20240117-4.fc40.x86_64 : Network monitoring tools including ping
Repo        : @System
Matched from:
Filename    : /usr/sbin/ping

iputils-20240117-4.fc40.x86_64 : Network monitoring tools including ping
Repo        : fedora
Matched from:
Filename    : /usr/sbin/ping

[root@pe ~]#
```

lib/beaker/host_prebuilt_steps.rb

@@ -11,8 +11,8 @@ module HostPrebuiltSteps
     SLEEPWAIT = 5
     TRIES = 5
     AMAZON2023_PACKAGES = %w[chrony]
-    RHEL8_PACKAGES = %w[chrony]
-    FEDORA_PACKAGES = %w[chrony]
+    RHEL8_PACKAGES = %w[chrony iputils] # iputils provides ping. beaker assumes that's present
+    FEDORA_PACKAGES = %w[chrony iputils]
     UNIX_PACKAGES = %w[curl ntpdate]
     FREEBSD_PACKAGES = ['curl', 'perl5|perl']
     OPENBSD_PACKAGES = ['curl']