Bump off of libthrift 0.9.1 in /webindex (#30)

* Remove unneeded declaration of transitive dependency, libthrift

Bumps [libthrift](https://github.com/apache/thrift) away from 0.9.1
- [Release notes](https://github.com/apache/thrift/releases)
- [Changelog](https://github.com/apache/thrift/blob/master/CHANGES.md)
- [Commits](apache/thrift@0.9.1...v0.14.0)

---
updated-dependencies:
- dependency-name: org.apache.thrift:libthrift
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: Christopher Tubbs <ctubbsii@apache.org>

webindex/pom.xml

@@ -40,7 +40,6 @@
     <fluo.version>1.2.0</fluo.version>
     <hadoop.version>2.6.3</hadoop.version>
     <spark.version>1.6.2</spark.version>
-    <thrift.version>0.9.1</thrift.version>
   </properties>
   <dependencyManagement>
     <dependencies>
@@ -175,11 +174,6 @@
         <artifactId>spark-core_2.10</artifactId>
         <version>${spark.version}</version>
       </dependency>
-      <dependency>
-        <groupId>org.apache.thrift</groupId>
-        <artifactId>libthrift</artifactId>
-        <version>${thrift.version}</version>
-      </dependency>
       <dependency>
         <groupId>org.apache.zookeeper</groupId>
         <artifactId>zookeeper</artifactId>