Fix travis build to use https maven gradle repository

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright © 2016-2020 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.
+
+-->
+<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd" xmlns="http://maven.apache.org/SETTINGS/1.1.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <mirrors>
+        <mirror>
+            <id>gradle-fix</id>
+            <name>Gradle fix</name>
+            <url>https://repo.gradle.org/gradle/libs-releases-local</url>
+            <mirrorOf>gradle</mirrorOf>
+        </mirror>
+    </mirrors>
+</settings>

@@ -3,6 +3,7 @@ before_install:
   - export M2_HOME=/usr/local/maven
   - export MAVEN_OPTS="-Dmaven.repo.local=$HOME/.m2/repository -Xms1024m -Xmx3072m"
   - export HTTP_LOG_CONTROLLER_ERROR_STACK_TRACE=false
+  - cp .travis.settings.xml $HOME/.m2/settings.xml
 jdk:
  - openjdk8
 language: java