Bump buildroot to 2019.02

bsp/buildroot/package/mender/mender.service

@@ -0,0 +1,24 @@
+[Unit]
+Description=Mender OTA update service
+After=systemd-resolved.service
+
+[Service]
+Type=idle
+User=root
+Group=root
+ExecStartPre=/bin/sh -c '\
+if [ -L /var/lib/mender \
+     -a "$(readlink /var/lib/mender)" = "/var/run/mender" ]; then \
+    if rm -f /var/lib/mender >/dev/null 2>&1; then \
+        mkdir -p /var/lib/mender; \
+    else \
+        echo "No persistent location to store mender data. Data will be lost\
+        echo "at reboot. Are you sure this is what you want to do?"; \
+        mkdir -p "$(readlink /var/lib/mender)"; \
+    fi; \
+fi'
+ExecStart=/usr/bin/mender -daemon
+Restart=on-abort
+
+[Install]
+WantedBy=multi-user.target