[MINOR] make the launcher project name consistent with others

I found this by chance while building spark and think it is better to keep its name consistent with other sub-projects (Spark Project *).

I am not gonna file JIRA as it is a pretty small issue.

Author: WangTaoTheTonic <wangtao111@huawei.com>

Closes #6603 from WangTaoTheTonic/projName and squashes the following commits:

994b3ba [WangTaoTheTonic] make the project name consistent

launcher/pom.xml

@@ -29,7 +29,7 @@
   <groupId>org.apache.spark</groupId>
   <artifactId>spark-launcher_2.10</artifactId>
   <packaging>jar</packaging>
-  <name>Spark Launcher Project</name>
+  <name>Spark Project Launcher</name>
   <url>http://spark.apache.org/</url>
   <properties>
     <sbt.project.name>launcher</sbt.project.name>