Added modifyPropertiesFromFile Method in ConfigCommand

[rsingh433]

[EdColeman]

The build failed with a dependency problem

[ERROR] Used undeclared dependencies found:
[ERROR]    org.apache.commons:commons-configuration2:jar:2.9.0:compile

The dependency needs to be added to the ./shell/pom.xml file. The version is declared in the parent pom, so:

<dependency>
     <groupId>org.apache.commons</groupId>
     <artifactId>commons-configuration2</artifactId>
</dependency>

should be sufficient,