Update the class with String format for string generation and method doc comments

Conflicts:
	components/org.apache.stratos.rest.endpoint/src/main/java/org/apache/stratos/rest/endpoint/api/StratosApiV41Utils.java
Update the class with String format for string generation and method doc comments
Update error handling in rest API and meta data service
Update the messaging model util with apache commons isNumber util method
Update the messaging model util with apache commons isNumber util method
Update the messaging model util with apache commons isNumber util method
Update the messaging model util with apache commons isNumber util method
Merge the changes