lib: Changes to support hash algo in keychain.

lib: Changes to support hash algo in keychain.

Problem Statement:
==================
Currently there is no support for configuring hash algorithm in
keychain. 
 
RCA:
====
Not implemented yet.
 
Fix:
====
Changes are done to configure hash algorithm as part of keychain.
which will easy the configuration from modules using keychain.
 
Risk:
=====
Low risk
 
Tests Executed:
===============
Have tested the configuration and unconfiguration flow for newly
implemented CLI.

!
key chain abcd
 key 100
  key-string password
  cryptographic-algorithm sha1
 exit
 key 200
  key-string password
  cryptographic-algorithm sha256
 exit
!

Signed-off-by: Abhinay Ramesh <rabhinay@vmware.com>