Merge configuration files when installing features

[Niranjan-K]

For example in Carbon 5.1.0, there is a configuration file called launch.properties and Carbon-security maintains a copy of the file since it needs to add some properties to it. Need a mechanism to merge the two files when installing the feature.
Different types of configuration files are:

• properties file Merge configuration (Properties) files when installing features #48
• xml file Merge configuration (XML) files when installing features #49
• yaml file Merge configuration (YAML) files when installing features #50