Refactor parse() function of xCommandLineArguments.java files across policy repos. 

Handling of remainingArgs and the statements pertaining to it have to refactored, as it is observed that some parts of the code are redundant or never used.

Following files (not limited, could be more in policy repos) have to be considered.

./models/models-sim/models-sim-dmaap/src/main/java/org/onap/policy/models/sim/dmaap/startstop/DmaapSimCommandLineArguments.java
./models/models-sim/policy-models-sim-pdp/src/main/java/org/onap/policy/models/sim/pdp/PdpSimulatorCommandLineArguments.java
./policy-apex-pdp/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/ApexStarterCommandLineArguments.java
./policy-api/main/src/main/java/org/onap/policy/api/main/startstop/ApiCommandLineArguments.java
./policy-distribution/main/src/main/java/org/onap/policy/distribution/main/startstop/DistributionCommandLineArguments.java
./policy-pap/main/src/main/java/org/onap/policy/pap/main/startstop/PapCommandLineArguments.java