Update Dunfell branch to IoT Edge version 1.2.6.

Create all the recipes needed to integrate the iotedge runtime
version 1.2.6. It include the recipes for the daemon and the
identity-service.
This version has been tested with the following DPS methods:
- Symmectric key
- TPM

It build the last official release :
'https://github.com/Azure/iotedge/releases/tag/1.2.6'

Ref: Azure#63

README.md

@@ -12,7 +12,7 @@ This layer depends on:
 ```
 URI: git://github.com/meta-rust/meta-rust.git
 branch: master
-revision: 7ff669d8cedd83a2d3efb73073a63b0a7efffddc
+revision: 25ee517ae26581ca8d5f569c6e38cba6ff4a7d3e
 prio: default
 ```
 

recipes-core/aziot-cli/aziot-cli-1.2.6.inc

@@ -0,0 +1 @@
+export VERSION = "1.2.6"

recipes-core/aziot-cli/aziot-cli.inc

@@ -0,0 +1,10 @@
+DEPENDS += "openssl "
+
+export OPENSSL_DIR = "${STAGING_EXECPREFIXDIR}"
+export LIBIOTHSM_NOBUILD="On"
+
+do_install () {
+    # Binaries
+    install -d  "${D}${bindir}"
+    install -m 755 "${WORKDIR}/build/target/${TARGET_SYS}/release/iotedge" ${D}${bindir}/iotedge
+}

recipes-core/aziot-cli/aziot-cli/0001-Fix-edgelet-iotedge-code.patch

@@ -0,0 +1,25 @@
+From 8c40fae9f235c005fc241f09cec9ea982c183b2a Mon Sep 17 00:00:00 2001
+From: Pierrick Curt <pierrick.curt@rtone.fr>
+Date: Mon, 26 Apr 2021 18:39:51 +0000
+Subject: [PATCH] Fix edgelet/iotedge code
+
+---
+ edgelet/iotedge/src/check/mod.rs | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/edgelet/iotedge/src/check/mod.rs b/edgelet/iotedge/src/check/mod.rs
+index 44b5df5c2..041fdc6d5 100644
+--- a/edgelet/iotedge/src/check/mod.rs
++++ b/edgelet/iotedge/src/check/mod.rs
+@@ -237,7 +237,7 @@ impl Check {
+             description: String,
+             result: CheckResult,
+             additional_info: serde_json::Value,
+-        };
++        }
+
+         let mut checks: BTreeMap<String, CheckOutputSerializable> = Default::default();
+
+-- 
+2.17.1
+

recipes-core/aziot-cli/aziot-cli_%.bbappend

@@ -0,0 +1 @@
+SRC_URI += "file://0001-Fix-edgelet-iotedge-code.patch"

recipes-core/aziot-daemon/aziot-daemon-1.2.6.inc

@@ -0,0 +1 @@
+export VERSION = "1.2.6"

recipes-core/aziot-daemon/aziot-daemon.inc

@@ -0,0 +1,45 @@
+DEPENDS += "openssl virtual/docker aziot-cli aziotd"
+RDEPENDS_${PN} += "docker aziot-cli aziotd"
+
+inherit systemd
+SYSTEMD_AUTO_ENABLE_${PN} = "enable"
+SYSTEMD_SERVICE_${PN} = "aziot-edged.service"
+
+SRC_URI += "file://aziot-edged.service  \
+"
+
+do_install () {
+    # Binaries
+    install -d  "${D}${bindir}"
+
+    install -m 755 "${WORKDIR}/build/target/${TARGET_SYS}/release/aziot-edged" ${D}${bindir}/aziot-edged
+
+    # Config file
+    install -d "${D}${sysconfdir}/aziot"
+    install -d "${D}${sysconfdir}/aziot/edged"
+    install -d "${D}${sysconfdir}/aziot/edged/config.d"
+
+    # Data dir
+    install -d -o iotedge -g iotedge "${D}${localstatedir}/lib/iotedge"
+
+    if ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then
+        install -d ${D}${systemd_unitdir}/system
+        install -m 644 ${WORKDIR}/aziot-edged.service ${D}${systemd_unitdir}/system
+        install -m 644 ${WORKDIR}/git/edgelet/contrib/systemd/debian/aziot-edged.workload.socket ${D}${systemd_unitdir}/system
+        install -m 644 ${WORKDIR}/git/edgelet/contrib/systemd/debian/aziot-edged.mgmt.socket ${D}${systemd_unitdir}/system
+    else
+        install -d ${D}${sysconfdir}/init.d
+        install -m 755 ${WORKDIR}/git/edgelet/contrib/debian/iotedge.init ${D}${sysconfdir}/init.d/iotedge
+    fi
+}
+
+inherit useradd
+USERADD_PACKAGES = "${PN}"
+USERADD_PARAM_${PN} = "-r -u 15580 -g iotedge -G docker -s /bin/false -d ${localstatedir}/lib/iotedge iotedge"
+GROUPADD_PARAM_${PN} = "-r -g 15580 iotedge"
+
+FILES_${PN} += " \
+    ${systemd_unitdir}/system/* \
+    ${localstatedir}/lib/iotedge \
+    ${sysconfdir}/aziot/ \
+    "

recipes-core/aziot-daemon/aziot-daemon/aziot-edged.service

@@ -0,0 +1,19 @@
+[Unit]
+Description=Azure IoT Edge daemon
+After=docker.service aziot-edged.workload.socket aziot-edged.mgmt.socket
+Requires=aziot-edged.workload.socket aziot-edged.mgmt.socket
+Wants=docker.service
+Documentation=man:aziot-edged(8)
+
+[Service]
+ExecStart=/usr/bin/aziot-edged
+KillMode=process
+TimeoutStartSec=600
+TimeoutStopSec=40
+Restart=on-failure
+RestartPreventExitStatus=153
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+Also=aziot-edged.workload.socket aziot-edged.mgmt.socket