ds-cloud-identify: allow disabling on FreeBSD

sometimes it's preferable to disable ds-identify, for example when the
results it returns are bogus, or when we know the results can set them
ourselves, because they are unchanging.

Allow disabling the service, rather than having to delete it.

Sponsored by: The FreeBSD Foundation

sysvinit/freebsd/dsidentify.tmpl

@@ -23,18 +23,21 @@ rcvar="cloudinit_enable"
 
 dsidentify_start()
 {
-    echo "${command} starting"
-    if kenv -q kernel_options | grep -q 'cloud-init=disabled'; then
-        warn "cloud-init is disabled via kernel_options."
-    elif test -e {{ prefix }}/etc/cloud-init.disabled; then
-        warn "cloud-init is disabled via cloud-init.disabled file."
-    else
-        ${command}
+    if checkyesno cloudinit_dsidentify_enable; then
+        echo "${command} starting"
+        if kenv -q kernel_options | grep -q 'cloud-init=disabled'; then
+            warn "cloud-init is disabled via kernel_options."
+        elif test -e {{ prefix }}/etc/cloud-init.disabled; then
+            warn "cloud-init is disabled via cloud-init.disabled file."
+        else
+            ${command}
+        fi
     fi
 }
 
 load_rc_config 'cloudinit'
 
 : ${cloudinit_enable="NO"}
+: ${cloudinit_dsidentify_enable="YES"}
 
 run_rc_command "$1"