connman: Set dns-backend automatically

connman supports systemd-resolved as a resolver, select it automatically when
DISTRO_FEATURES includes systemd-resolved support, then drop the patch which
disables connman when systemd-resolved is active.

(From OE-Core rev: bec0cfc9b21566348886a8122c9b0756539b416d)

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/connman/connman/0001-connman.service-stop-systemd-resolved-when-we-use-co.patch

@@ -1,26 +0,0 @@
-From 19aff57e4da920d9ca972903582305b4efe81ef3 Mon Sep 17 00:00:00 2001
-From: "Maxin B. John" <maxin.john@intel.com>
-Date: Mon, 12 Jun 2017 16:52:39 +0300
-Subject: [PATCH] connman.service: stop systemd-resolved when we use connman
-
-Stop systemd-resolved service when we use connman as network manager.
-
-Upstream-Status: Inappropriate [configuration]
-
-Signed-off-by: Maxin B. John <maxin.john@intel.com>
----
- src/connman.service.in | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/src/connman.service.in b/src/connman.service.in
-index 7376346..79e75d6 100644
---- a/src/connman.service.in
-+++ b/src/connman.service.in
-@@ -6,6 +6,7 @@ RequiresMountsFor=@localstatedir@/lib/connman
- After=dbus.service network-pre.target systemd-sysusers.service
- Before=network.target multi-user.target shutdown.target
- Wants=network.target
-+Conflicts=systemd-resolved.service
- 
- [Service]
- Type=dbus

meta/recipes-connectivity/connman/connman_1.44.bb

@@ -19,7 +19,6 @@ CVE_PRODUCT = "connman connection_manager"
 DEPENDS  = "dbus glib-2.0"
 
 SRC_URI = "${KERNELORG_MIRROR}/linux/network/${BPN}/${BP}.tar.xz \
-           file://0001-connman.service-stop-systemd-resolved-when-we-use-co.patch \
            file://connman \
            file://0002-resolve-musl-does-not-implement-res_ninit.patch \
            "
@@ -40,6 +39,7 @@ EXTRA_OECONF += "\
     --enable-tools \
     --disable-polkit \
     --runstatedir='${runtimedir}' \
+    --with-dns-backend='${@bb.utils.contains("DISTRO_FEATURES", "systemd-resolved", "systemd-resolved", "internal", d)}' \
 "
 # For smooth operation it would be best to start only one wireless daemon at a time.
 # If wpa-supplicant is running, connman will use it preferentially.