add upgrade_dev_db.sh script, which allows to upgrade an already existing developer database (#2267)

+#!/bin/bash
+#
+# Copyright © 2016-2019 The Thingsboard Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+for i in "$@"
+do
+case $i in
+    --fromVersion=*)
+    FROM_VERSION="${i#*=}"
+    shift
+    ;;
+    *)
+            # unknown option
+    ;;
+esac
+done
+
+if [[ -z "${FROM_VERSION// }" ]]; then
+    echo "--fromVersion parameter is invalid or unspecified!"
+    echo "Usage: upgrade_dev_db.sh --fromVersion={VERSION}"
+    exit 1
+else
+    fromVersion="${FROM_VERSION// }"
+fi
+
+BASE=${project.basedir}/target
+CONF_FOLDER=${BASE}/conf
+jarfile="${BASE}/thingsboard-${project.version}-boot.jar"
+installDir=${BASE}/data
+loadDemo=true
+
+
+export JAVA_OPTS="$JAVA_OPTS -Dplatform=@pkg.platform@"
+export LOADER_PATH=${BASE}/conf,${BASE}/extensions
+export SQL_DATA_FOLDER=${SQL_DATA_FOLDER:-/tmp}
+
+
+run_user="$USER"
+
+sudo -u "$run_user" -s /bin/sh -c "java -cp ${jarfile} $JAVA_OPTS -Dloader.main=org.thingsboard.server.ThingsboardInstallApplication \
+                    -Dinstall.data_dir=${installDir} \
+                    -Dinstall.load_demo=${loadDemo} \
+                    -Dspring.jpa.hibernate.ddl-auto=none \
+                    -Dinstall.upgrade=true \
+                    -Dinstall.upgrade.from_version=${fromVersion} \
+                    -Dlogging.config=logback.xml \
+                    org.springframework.boot.loader.PropertiesLauncher"
+
+if [ $? -ne 0 ]; then
+    echo "ThingsBoard DB installation failed!"
+else
+    echo "ThingsBoard DB installed successfully!"
+fi
+
+exit $?