stigenable: drop redundant packages from KS_STIG_PACKAGES

Three of the eight entries are removed. Each is either already satisfied
transitively or is dead weight:

  libselinux-utils  already a dependency of selinux-policy, and the
                    stig-hardening role never invokes any of its binaries
  ntp               installed but never configured - no task in the role
                    notifies the time-sync handlers, and 0 of the 107
                    PHTN-50-xxxxxx controls cover time sync
  libgcrypt         a workaround for aide declaring only an unversioned
                    Requires: libgcrypt; that belongs in aide.spec

The same three are dropped from examples/ova/packages_stig.json, so the OVA
package list and the installer's own list say the same thing. Keeping the two
in step matters: a list restated in two places is how the media and the
installer drifted apart in the first place.

Verified on four real STIG installs - two on photon-os-installer 2.8, two on
latest - whose manifests carry the reduced additional_packages list
[audit, rsyslog, openssl-fips-provider, selinux-policy, aide]:

  libselinux-utils              installed, transitively
  libgcrypt                     installed, transitively
  ntp / ntpsec                  absent, and time sync works via
                                systemd-timesyncd

aide's dependency is now a versioned Requires: libgcrypt >= 1.10.4, confirmed
in aide-0.19-3.ph5, so nothing rests on the unversioned form any more.

Signed-off-by: Daniel Casota <dcasota@gmail.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JW73JTCUGRcaNTUEQcAMtf

Author: dcasota

examples/ova/packages_stig.json

@@ -14,8 +14,7 @@
         "less",
         "sudo",
         "lvm2",
-        "audit", "rsyslog", "openssl-fips-provider", "selinux-policy",
-        "libselinux-utils", "ntp", "aide", "libgcrypt"
+        "audit", "rsyslog", "openssl-fips-provider", "selinux-policy", "aide"
     ],
     "packages_x86_64": ["linux-esx"]
 }

photon_installer/stigenable.py

@@ -23,10 +23,7 @@
     "rsyslog",
     "openssl-fips-provider",
     "selinux-policy",
-    "libselinux-utils",
-    "ntp",
-    "aide",
-    "libgcrypt"
+    "aide"
 ]