add mongodb support for hyperopt parallelization

scripts/start-hyperopt-worker.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+DB_NAME=freqtrade_hyperopt
+
+hyperopt-mongo-worker --mongo=127.0.0.1:1234/${DB_NAME} --poll-interval=0.1

scripts/start-mongodb.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -e
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+DB_PATH="${DIR}/../.mongodb"
+
+mkdir -p ${DB_PATH}
+mongod --dbpath ${DB_PATH} \
+    --bind_ip 127.0.0.1 \
+    --port 1234 \
+    --directoryperdb \
+    --journal \
+    --nohttpinterface