install: add database reset tool

install/reset.sh

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+pm2 stop mongodb
+rm -rf /data/db /data/file
+mkdir /data/db /data/file
+pm2 start mongod
+sleep 3
+db_password=$(cat /dev/urandom | head -n 10 | md5sum | head -c 20)
+echo "db.createUser({
+  user: 'hydro',
+  pwd: '$db_password',
+  roles: [
+    { role: 'readWrite', db: 'hydro' }
+  ]
+})" >/tmp/createUser.js
+mongo 127.0.0.1:27017/hydro /tmp/createUser.js
+echo "{\"host\":\"127.0.0.1\",\"port\":\"27017\",\"name\":\"hydro\",\"username\":\"hydro\",\"password\":\"$db_password\"}" >~/.hydro/config.json
+pm2 stop mongod
+pm2 del mongod
+pm2 restart minio
+pm2 start mongodb
+pm2 restart hydrooj
+pm2 save