test: if haveged is part of initrd it needs to be installed in the image too

Otherwise haveged won't survive when switching root from initrd to host making
haveged service in host fail.

test/test-functions

@@ -664,6 +664,7 @@ setup_basic_environment() {
     install_fs_tools
     install_modules
     install_plymouth
+    install_haveged
     install_debug_tools
     install_ld_so_conf
     install_testuser
@@ -1426,6 +1427,16 @@ install_plymouth() {
     # fi
 }
 
+install_haveged() {
+    # If haveged is installed and probably included in initrd, it needs to be
+    # installed in the image too.
+    if [ -x /usr/sbin/haveged ]; then
+        dinfo "Install haveged files"
+        inst /usr/sbin/haveged
+        inst /usr/lib/systemd/system/haveged.service
+    fi
+}
+
 install_ld_so_conf() {
     dinfo "Install /etc/ld.so.conf*"
     cp -a /etc/ld.so.conf* "${initdir:?}/etc"