[issue-64] Rework specification of the dependency versions

This changes how we specify versions for dependencies, and plugins: - all versions are now
listed in `dependencyManagement` and `pluginManagement` sections in the
`mvn-defaults/pom.xml`.  Usage of dependencies and plugins should be done without explicit
`version` tag.

Also:

* unified discrepancies between versions of plugins and dependencies
* bumped versions for commons-codec, commons-csv, commons-compress, docker-java

this fixes #64

engine-cli/pom.xml

@@ -36,27 +36,23 @@
     <dependency>
       <groupId>org.testng</groupId>
       <artifactId>testng</artifactId>
-      <version>6.13.1</version>
       <scope>test</scope>
     </dependency>
 
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
 
     <dependency>
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core-java8</artifactId>
-      <version>1.0.0m1</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.2.3</version>
     </dependency>
     <dependency>
       <groupId>io.nosqlbench</groupId>
@@ -96,7 +92,6 @@
         <plugins>
           <plugin>
             <artifactId>maven-shade-plugin</artifactId>
-            <version>3.2.0</version>
             <configuration>
               <transformers combine.children="append">
                 <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">