Do not systemctl enable individual services

The `cfengine3.service` uses `Wants` to start all the other
available CFEngine services. `systemctl enable` on one of the
individual services causes them to be started in their respective
`.target` (e.g. `multi-user.target`) and thus `systemctl disable
cfengine3` is not enough to stop them from being started on boot.

Being able to enable individual services is useful, but it
shouldn't be done by default.

(cherry picked from commit f53a8f1)

packaging/common/cfengine-hub/postinstall.sh

@@ -1044,19 +1044,9 @@ if ! is_upgrade; then
   if [ -x /bin/systemctl ]; then
     # Reload systemd config to pick up newly installed units
     /bin/systemctl daemon-reload > /dev/null 2>&1
-    # Enable service units
-    # Enabling services is OK to fail (they can be masked, for example)
-    set +e
-    /bin/systemctl enable cf-apache.service > /dev/null 2>&1
-    /bin/systemctl enable cf-execd.service > /dev/null 2>&1
-    /bin/systemctl enable cf-serverd.service > /dev/null 2>&1
-    /bin/systemctl enable cf-runalerts.service > /dev/null 2>&1
-    /bin/systemctl enable cf-monitord.service > /dev/null 2>&1
-    /bin/systemctl enable cf-postgres.service > /dev/null 2>&1
-    /bin/systemctl enable cf-hub.service > /dev/null 2>&1
-    /bin/systemctl enable cf-reactor.service > /dev/null 2>&1
-    /bin/systemctl enable cfengine3.service > /dev/null 2>&1
-    set -e
+    # Enable cfengine3 service (starts all the other services)
+    # Enabling the service is OK to fail (can be masked, for example)
+    /bin/systemctl enable cfengine3.service > /dev/null 2>&1 || true
   else
     case "`os_type`" in
       redhat)

packaging/common/cfengine-non-hub/postinstall.sh

@@ -64,14 +64,9 @@ case `os_type` in
     if [ -x /bin/systemctl ]; then
       # Reload systemd config to pick up newly installed units
       /bin/systemctl daemon-reload > /dev/null 2>&1
-      # Enable service units
-      # Enabling services is OK to fail (they can be masked, for example)
-      set +e
-      /bin/systemctl enable cf-execd.service > /dev/null 2>&1
-      /bin/systemctl enable cf-serverd.service > /dev/null 2>&1
-      /bin/systemctl enable cf-monitord.service > /dev/null 2>&1
-      /bin/systemctl enable cfengine3.service > /dev/null 2>&1
-      set -e
+      # Enable cfengine3 service (starts all the other services)
+      # Enabling the service is OK to fail (can be masked, for example)
+      /bin/systemctl enable cfengine3.service > /dev/null 2>&1 || true
     else
       case `os_type` in
         redhat)