Gradle build: add mavenLocal() repository

### Motivation

In Gradle you need to add `mavenLocal()` repository if you want to test local versions of third party libraries built with Maven (like ZooKeeper, Curator...)


### Changes
Add `mavenLocal()`  repository

Reviewers: Matteo Merli <mmerli@apache.org>, Nicolò Boschi <boschi1997@gmail.com>, Andrey Yegorov <None>

This closes #3114 from eolivelli/impl/gradle-maven-local

build.gradle

@@ -351,6 +351,7 @@ allprojects {
 
     repositories {
         mavenCentral()
+        mavenLocal()
     }
 }