JAVA-9486: Use guava.version defined in the parent pom

testing-modules/mockito/pom.xml

@@ -70,8 +70,6 @@
         <spring-boot.version>2.0.4.RELEASE</spring-boot.version>
         <spring-framework.version>5.0.8.RELEASE</spring-framework.version>
         <spring-data.version>2.0.9.RELEASE</spring-data.version>
-        <!-- util -->
-        <guava.version>19.0</guava.version>
         <!-- testing -->
         <powermock.version>2.0.2</powermock.version>
         <javax.persistence.version>2.1.1</javax.persistence.version>

testing-modules/rest-assured/pom.xml

@@ -160,9 +160,7 @@
     </dependencies>
 
     <properties>
-        <guava.version>18.0</guava.version>
         <jackson-coreutils.version>1.8</jackson-coreutils.version>
-        <guava.version>19.0</guava.version>
         <servlet-api.version>2.5</servlet-api.version>
         <javax.mail.version>1.4.7</javax.mail.version>
         <jetty.version>9.4.0.v20161208</jetty.version>

testing-modules/rest-testing/pom.xml

@@ -126,8 +126,6 @@
     </profiles>
 
     <properties>
-        <!-- util -->
-        <guava.version>19.0</guava.version>
         <!-- testing -->
         <rest-assured.version>2.9.0</rest-assured.version>
         <cucumber.version>6.8.0</cucumber.version>