Rescue bug: tinyipa fails to acquire IP in multitenant env

It seems the udhcpc script is not executable and no sleeping
cause tinyipa fails to acquire IP in multi-tenant env.

Story: #2002024
Change-Id: I3a693d75bfa54fe905bd3cd0587bb139934c087c

imagebuild/tinyipa/build_files/bootlocal.sh

@@ -53,6 +53,8 @@ configure_dhcp_network() {
 
     # NOTE(TheJulia): We may need to add a short wait here as
     # network interface plugging actions may not be asynchronous.
+    echo "Sleeping 30 sec as network interface is being updated"
+    sleep 30
     INTERFACES=$(ip -o link |grep "LOWER_UP"|cut -f2 -d" "|sed 's/://'|grep -v "lo")
     for interface in $INTERFACES; do
         pidfile="/var/run/udhcpc/${interface}.pid"

releasenotes/notes/tinyipa-rescue-dhcp-multi-tenant-b32bda7bf2b12679.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixes bug where TinyIPA fails to acquire IP address when
+    in RESCUE state and in multi-tenant environment.