Check for source file existence when loading lua scripts.
Check for source file existence when loading lua scripts.

pradeepsrinivasan/aerospike-client-java,alexandrnikitin/aerospike-client-java,alexandrnikitin/aerospike-client-java,pradeepsrinivasan/aerospike-client-java,wgpshashank/aerospike-client-java,wgpshashank/aerospike-client-java,Stratio/aerospike-client-java,Stratio/aerospike-client-java