[database-chassis]: Fix the way database-chassis start (#6099)

The service crash when the platform boots due to missing waits.
/usr/bin/database.sh tries to operate on a missing socket and fails.
We now wait for the chassis database to be ready the same way we do database.

dockers/docker-database/docker-database-init.sh

@@ -50,8 +50,6 @@ if [[ $DATABASE_TYPE == "chassisdb" ]]; then
     # Docker init for database-chassis
     echo "Init docker-database-chassis..."
     update_chassisdb_config -j $db_cfg_file_tmp -k -p $chassis_db_port
-    mkdir -p /var/run/redis/sonic-db
-    cp /etc/default/sonic-db/database_config.json /var/run/redis/sonic-db
     # generate all redis server supervisord configuration file
     sonic-cfggen -j $db_cfg_file_tmp -t /usr/share/sonic/templates/supervisord.conf.j2 > /etc/supervisor/conf.d/supervisord.conf
     rm $db_cfg_file_tmp

files/build_templates/docker_image_ctl.j2

@@ -144,6 +144,10 @@ function postStartAction()
         # Add redis UDS to the redis group and give read/write access to the group
         REDIS_SOCK="/var/run/redis${DEV}/redis.sock"
     else
+        until [[ ($(docker exec -i ${DOCKERNAME} pgrep -x -c supervisord) -gt 0) &&
+                 ($(docker exec -i ${DOCKERNAME} $SONIC_DB_CLI CHASSIS_APP_DB PING | grep -c True) -gt 0) ]]; do
+           sleep 1
+        done
         REDIS_SOCK="/var/run/redis-chassis/redis_chassis.sock"
     fi
     chgrp -f redis $REDIS_SOCK && chmod -f 0760 $REDIS_SOCK