New on-boot example scripts (#275)

* [on-boot-script] Add 'shell-profile' example script

* [on-boot-script] Add 'cni-bridge' example script

on-boot-script/examples/udm-files/on_boot.d/10-shell-profile.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+## Configure shell profile
+
+device_info() {
+    echo $(/usr/bin/ubnt-device-info "$1")
+}
+
+# Modify login banner (motd)
+cat > /etc/motd <<EOF
+Welcome to UniFi Dream Machine!
+(c) 2010-$(date +%Y) Ubiquiti Inc. | http://www.ui.com
+
+Model:       $(device_info model)
+Version:     $(device_info firmware)
+MAC Address: $(device_info mac)
+EOF
+
+# Extend UbiOS prompt to include useful information
+cat > /etc/profile.d/prompt.sh <<'EOF'
+UDM_NAME="$(grep -m 1 '^name:' /data/unifi-core/config/settings.yaml | awk -F: '{ gsub(/^[ \t]+|[ \t]+$/, "", $2); print tolower($2) }')"
+PROMPT_MAIN="\u@${UDM_NAME}:\w"
+
+export PS1="[UDM] ${PROMPT_MAIN}${PS1}"
+EOF
+
+# Copy all global profile scripts (for all users) from `/mnt/data/on_boot.d/settings/profile/global.profile.d/` directory
+mkdir -p /mnt/data/on_boot.d/settings/profile/global.profile.d
+cp -rf /mnt/data/on_boot.d/settings/profile/global.profile.d/* /etc/profile.d/

on-boot-script/examples/udm-networking/on_boot.d/05-cni-bridge.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+## Create network bridge for CNI
+
+ip link show cni0 > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+    ip link add cni0 type bridge
+fi