Maven: Format pom.xml with xmllint

Change-Id: Ief0b7a4f9063bbcb20c5b14436a8323b5a4c053a
diff --git a/pom.xml b/pom.xml
index 8807488..ead9d2d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <!--
   ~ Copyright 2017 Cisco Systems, Inc.
   ~
@@ -16,25 +15,18 @@
   ~ under the License.
   ~
   -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
-
     <groupId>com.cisco.gerrit.plugins</groupId>
     <artifactId>slack-integration</artifactId>
     <packaging>jar</packaging>
     <version>2.14.15</version>
     <name>Slack Integration Plugin</name>
-
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-
         <gerrit-api-type>plugin</gerrit-api-type>
         <gerrit-api-version>${project.version}</gerrit-api-version>
     </properties>
-
     <build>
         <plugins>
             <plugin>
@@ -67,7 +59,6 @@
                     <finalName>${project.artifactId}</finalName>
                 </configuration>
             </plugin>
-
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
@@ -79,7 +70,6 @@
             </plugin>
         </plugins>
     </build>
-
     <dependencies>
         <dependency>
             <groupId>com.google.gerrit</groupId>
@@ -87,35 +77,30 @@
             <version>${gerrit-api-version}</version>
             <scope>provided</scope>
         </dependency>
-
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
             <version>1.7.9</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
             <version>4.11</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-all</artifactId>
             <version>1.10.19</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>org.powermock</groupId>
             <artifactId>powermock-module-junit4</artifactId>
             <version>1.6.2</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>org.powermock</groupId>
             <artifactId>powermock-api-mockito</artifactId>