Removed Scp client.  It will not be needed for now.

AFDP-111
Added required throw clauses to interfaces.

AFDP-111
Created abstract base classes for client and credential.

AFDP-111
Created an instance helper class.
Created an instance preparer implementation.

AFDP-111
Created an interface defining an authentication initializer.

AFDP-111
Created a JSch password credential implementation.

AFDP-111
Created a JSch credential factory.

AFDP-111
Created a JSch implementation of the shell client.

AFDP-111
Created a JSch implementation of the client factory.

AFDP-111