Do not keep keygen running, check certs each time

Rely on condition of unbound-keygen service. If it does stop after
generating them, then it will recreate also after restart later. That
might be the case if someone removes these certificates.

(cherry picked from commit 9cab78fef5ee1fcddb20eecc465d0b7cac7d9a03)

Resolves: rhbz#2094336

unbound-keygen.service

@@ -13,7 +13,6 @@ Type=oneshot
 Group=unbound
 ExecStart=/usr/sbin/unbound-control-setup -d /etc/unbound/
 ExecStart=/sbin/restorecon /etc/unbound/*
-RemainAfterExit=yes
 
 [Install]
 WantedBy=multi-user.target

unbound.spec

@@ -30,7 +30,7 @@
 Summary: Validating, recursive, and caching DNS(SEC) resolver
 Name: unbound
 Version: 1.16.0
-Release: 1%{?extra_version:.%{extra_version}}%{?dist}
+Release: 2%{?extra_version:.%{extra_version}}%{?dist}
 License: BSD
 Url: https://nlnetlabs.nl/projects/unbound/
 Source: https://nlnetlabs.nl/downloads/%{name}/%{name}-%{version}%{?extra_version}.tar.gz
@@ -444,6 +444,9 @@ popd
 %attr(0644,root,root) %config %{_sysconfdir}/%{name}/root.key
 
 %changelog
+* Tue Jun 07 2022 Petr Menšík <pemensik@redhat.com> - 1.16.0-2
+- Restart keygen service before every unbound start (#2094336)
+
 * Sat Jun 04 2022 Petr Menšík <pemensik@redhat.com> - 1.16.0-1
 - Update to 1.16.0 (#2087120)