Fixed data block size bug for the client

PS. Observing an extra weird null response intermittently, which is currently being handled by a hack

Added some HPDOS architecture diagram

# Conflicts:
#	code/hpdos_client/app.config
#	code/hpdos_client/app/src/main/java/HpdosClient/ClientRunner.java

Added better metrics to client.
Client now configurable through config file

Needs more testing

Preliminary tests down on key create and read

Added Storage model
Added IO handler wrapper class

Added backend for in memory data storage

-- Added a basic interface at MDS to receive gRPC calls from client
-- Added basic infrastructure for RPC implementation
-- Added a client module for E2E implementation testing

Renamed p4 based test codes to tryouts folder