Description of problem:
When using the Maven plugin, source directory can be specified on the command line with -Dzanata.srcDir, or in pom.xml as a configuration option. Options on the command line should generally take precedence over options in configuration, but this does not appear to be the case.


Version-Release number of selected component (if applicable):


How reproducible:



Steps to Reproduce:
1. set up a pom.xml with zanata plugin srcDir specified:

<project>
   <modelVersion>4.0.0</modelVersion>
   <groupId>null</groupId>
   <artifactId>null</artifactId>
   <version>0</version>
 
   <build>
      <plugins>
         <plugin>
            <groupId>org.zanata</groupId>
            <artifactId>zanata-maven-plugin</artifactId>
            <version>3.3.0</version>
            <configuration>
               <srcDir>.</srcDir>
            </configuration>
         </plugin>
      </plugins>
   </build>
</project>

2. download a config file from Zanata website

3. run push command with a different srcDir specified, e.g.
$ mvn zanata:push -Dzanata.srcDir=different


Actual results:
plugin uses srcDir value from pom.xml

Expected results:
plugin uses srcDir value from command line